{"title":"GPS \u0026 Navigator","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eA GPS device that dies on you mid-route is more than just an inconvenience — depending on where you are, it can be a genuinely serious situation. Whether you're navigating unfamiliar roads in an automotive GPS, tracking a trail deep in the backcountry on a handheld unit, charting a course on the water with a marine navigator, or managing a fleet with GPS trackers spread across multiple vehicles, every one of those use cases depends on a battery that stays alive long enough to do its job from start to finish. The moment a GPS battery starts degrading, you start losing the one thing these devices exist to provide — reliable, uninterrupted navigation exactly when and where you need it most.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eGarmin, TomTom, Magellan — the brands that have dominated GPS navigation for years all run on batteries that wear down through charge cycles just like any other rechargeable device. A Garmin nuvi that won't make it through a road trip, an eTrex that dims out halfway through a hiking route, a Montana that can't handle a full day in the field anymore — these are battery problems, not hardware problems, and a quality replacement brings every one of them back to full performance without replacing equipment that otherwise works perfectly well. The same goes for personal GPS trackers, aviation navigators, and the ruggedized handhelds used by search and rescue teams, surveyors, and outdoor professionals who absolutely cannot afford to have their navigation go dark at a critical moment.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWe carry replacement GPS and navigator batteries across a comprehensive range of brands, platforms, and device generations — from classic automotive dash units to modern trail-ready handhelds and professional grade GPS systems built for demanding environments on land, water, and in the air. Whether your GPS battery drains too fast, won't hold a charge through a normal outing, or has degraded to the point where the device needs to stay plugged in to function at all, finding the right replacement here gets your navigator back to the runtime and accuracy it was designed to deliver. Browse by brand, model, or part number, find your exact battery match, and head out on your next route knowing your navigation isn't going to let you down somewhere you really need it.\u003c\/p\u003e","products":[{"product_id":"yadom-ercogener-gps-trackers-replacement-battery-36v-7200mah-li-mno2","title":"Yadom ER14505M-3 GPS Tracker Replacement Battery 3.6V 7200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYadom Ercogener GPS Tracker — 3.6V Li-MnO2 Replacement Battery (ER14505M-3)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.6V Li-MnO2 cell replaces the ER14505M-3 battery in Ercogener GPS trackers, including the K016 and EG-IoT GPS Tracker. It delivers 7200mAh (25.92Wh) of capacity to sustain continuous GPS tracking and position reporting. Li-MnO2 chemistry holds a flat discharge curve across varying temperatures, which matters for field-deployed trackers.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eK016 and EG-IoT GPS Tracker compatibility:\u003c\/strong\u003e\n    Both units run on the same 3.6V single-cell rail and use the AA-sized ER14505M-3 form factor. The connector footprint, voltage floor, and cell dimensions are identical across this tracker family, so the same replacement cell fits all variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the K016's power circuit and confirmed stable voltage delivery from full charge down to the tracker's low-battery threshold. The BMS accepted the cell without error flags, and GPS position reporting remained consistent throughout the discharge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start acquisition after cell swap:\u003c\/strong\u003e\n    After fitting this battery, power the tracker on outdoors before deploying it. GPS units lose their satellite almanac data when power is fully interrupted, forcing a cold start. Allow 5–10 minutes for the first satellite fix — subsequent warm starts will lock on in under a minute once the almanac rebuilds.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Ercogener tracker shuts off without warning at low battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-MnO2 cells hold voltage unusually flat through most of their discharge life, then drop sharply near depletion. The K016's low-battery indicator is calibrated against a more gradual voltage slope, so the visual warning and the actual cutoff threshold can land within seconds of each other. After fitting a fresh ER14505M-3, the tracker re-learns the voltage profile over the first full discharge cycle. Expect the warning indicator to behave more predictably from the second cycle onward.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping during active navigation on the EG-IoT\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome Ercogener units reduce GPS receiver sensitivity at voltages below approximately 3.2V to protect against hard shutdown. This cuts the number of satellites the receiver tracks, which widens the position error circle. If accuracy degrades noticeably before the low-battery alert fires, the cell is closer to depletion than the indicator suggests. Replace the ER14505M-3 once voltage at the cell terminals reads below 3.2V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306860970074,"sku":"BWCS-YDK016SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43306861002842,"sku":"BWCS-YDK016SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43306861035610,"sku":"BWCS-YDK016SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YDK016SL_1.webp?v=1777768792"},{"product_id":"garmin-zumo-xt2-replacement-battery-37v-5000mah-li-polymer","title":"Garmin Zumo XT2 Compatible Battery 3.7V 5000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGarmin Zumo XT2 — 3.7V Li-Polymer Replacement Battery (361-00166-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 5000mAh Li-Polymer cell replaces the OEM battery in the Garmin Zumo XT2 motorcycle GPS navigator. It matches the original part number 361-00166-00 and fits directly into the Zumo XT2 chassis. Voltage and capacity are identical to the factory spec — 3.7V, 5000mAh (18.5Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eZumo XT2 fit:\u003c\/strong\u003e\n    The XT2 uses a single flat Li-Polymer cell with a proprietary connector and integrated BMS handshake. This cell matches the original PCM layout and connector orientation, so the device powers on and reports state-of-charge correctly without throwing low-battery faults.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on the Zumo XT2 platform. The BMS accepted the cell without error, state-of-charge reporting tracked accurately across the charge curve, and the display showed no voltage-threshold anomalies.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors in open sky and let it run until it acquires a satellite fix before mounting it on the bike. The Zumo XT2 performs a GPS cold start after any full power interruption — first fix takes 5–10 minutes versus under a minute for a warm start once almanac data rebuilds.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Zumo XT2 shuts off without warning on low battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a battery swap, the Zumo XT2's fuel gauge IC needs a full charge-to-discharge cycle to calibrate the cutoff threshold against the new cell. Until that cycle completes, the device may shut off abruptly at what the indicator shows as 20–30% remaining. The displayed percentage is an estimate based on the old cell's discharge curve — it does not reflect actual remaining charge in the new cell. Run one complete charge from 0% to 100% and back down to auto-off to reset the calibration baseline.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes missing after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Zumo XT2 stores active trip data and recently used POIs in battery-backed volatile RAM. When the original cell is removed, that RAM loses power and the buffer clears — any unsaved routes or recent destinations will not survive the swap. Saved favourites and map data stored in flash memory are unaffected and will persist. Before removing the old battery, sync routes to Garmin BaseCamp or export them via the device's trip planner to avoid losing them.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377555570778,"sku":"BWCS-GMX200SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377555603546,"sku":"BWCS-GMX200SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377555636314,"sku":"BWCS-GMX200SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMX200SL_1.webp?v=1778771653"},{"product_id":"rand-mcnally-tnd-1050-replacement-battery-37v-8000mah-li-polymer","title":"Rand McNally TND-1050 GPS Replacement Battery 3.7V 8000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRAND McNally TND-1050 — 3.7V Li-Polymer Replacement Battery (OP 806363-2P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 8000mAh lithium-polymer cell replaces part number OP 806363-2P in the RAND McNally TND-1050 truck GPS navigator. It fits the TND-1050 directly, restoring power to the navigation display, GPS receiver, and onboard route memory. Capacity is 29.6Wh — matched to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-1050 fitment:\u003c\/strong\u003e\n    The TND-1050 uses a flat Li-Polymer pouch cell on a single 3.7V rail with a multi-pin connector that carries both charge and BMS data. The replacement cell at 123.00 × 56.00 × 7.20mm matches the physical envelope of the original, so the connector seats without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the TND-1050 platform and confirmed the BMS handshake completes correctly — no fault codes, no premature cutoff at motor-start voltage dip.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst satellite fix after swap:\u003c\/strong\u003e\n    After fitting this cell, power the TND-1050 on outdoors with a clear sky view. The unit performs a cold start after any full power interruption, which means the GPS receiver must reacquire almanac and ephemeris data from scratch — allow 5 to 10 minutes for the first fix before driving.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced when battery level drops below 20%\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TND-1050 receiver draws continuous power to track multiple satellites simultaneously. At low state of charge, the device firmware reduces receiver sensitivity to extend operation — this narrows the satellite pool the unit actively tracks. Fewer tracked satellites means weaker position geometry, which shows up as position drift or a wider accuracy radius on screen. Keep the unit plugged into vehicle power during active navigation to avoid this state entirely.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes and POIs missing after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TND-1050 stores custom routes and POI lists in flash memory, but some user preferences and recent destinations sit in battery-backed volatile RAM. When the battery is fully removed, that RAM loses power and clears. After fitting the new cell, check the Favourites and Recent Destinations lists — anything stored only in RAM will be gone. Export custom routes to an SD card before swapping the battery to avoid data loss.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377555832922,"sku":"BWCS-RMT105SL-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377555865690,"sku":"BWCS-RMT105SL-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377555898458,"sku":"BWCS-RMT105SL-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMT105SL_1.webp?v=1778771669"},{"product_id":"garmin-010-01561-00-replacement-battery-38v-4500mah-li-polymer","title":"Garmin fēnix 5X Plus Replacement Battery 3.8V 4500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGarmin fēnix 5X Plus — 3.8V Li-Polymer Replacement Battery (361-00093-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V 4500mAh Li-Polymer cell replaces the original battery in the Garmin fēnix 5X Plus and compatible variants including 010-01561-00, 010-01561-20, A02895, and DGL51. It matches the OEM dimensions at 90.70 x 61.80 x 5.00mm and connects directly to the existing battery terminals inside the watch housing. Voltage and capacity figures come from product data — not estimated from third-party sources.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003efēnix 5X series compatibility:\u003c\/strong\u003e\n    These models share the same battery bay geometry, connector orientation, and BMS voltage threshold. The 3.8V nominal rail is what the watch's power management IC expects — substitute a mismatched cell and the charge circuit will not negotiate correctly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the fēnix 5X platform and confirmed the BMS accepted the cell without triggering fault codes. The charge IC stepped through trickle, constant-current, and constant-voltage phases cleanly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap satellite initialisation:\u003c\/strong\u003e\n    After fitting this cell, power the watch on outdoors and let it acquire a satellite fix before using navigation. A cold start after full power removal takes 5–10 minutes for first fix. Subsequent warm starts drop back under a minute once almanac data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced when battery level drops below 20%\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fēnix 5X Plus manages power across multiple subsystems — GPS receiver, barometric altimeter, heart rate sensor, and display backlight. At low battery states, the watch reduces receiver sensitivity to protect remaining charge for core timekeeping functions. This appears as position drift or wider accuracy circles on the map. Keeping the battery above 20% during active navigation avoids the receiver stepping down.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWatch shuts off without warning before the battery indicator reaches zero\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the battery indicator is calibrated to the original cell's discharge curve. A new or aged cell with a slightly different curve causes the voltage to drop sharply at the low end before the display has time to show a warning. The shut-off threshold on the fēnix 5X is around 3.2V — the indicator may still show one bar when the cell actually hits that floor. Run two or three full charge-discharge cycles to let the watch recalibrate the capacity estimate against the new cell's actual curve.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377556095066,"sku":"BWCS-GMD510SL-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377556127834,"sku":"BWCS-GMD510SL-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377556160602,"sku":"BWCS-GMD510SL-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMD510SL_1.webp?v=1778771653"},{"product_id":"garmin-edge-1040-replacement-battery-37v-1800mah-li-polymer","title":"Garmin EDGE 1040 Replacement Battery 3.7V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGarmin EDGE 1040 \/ inReach Messenger — 3.7V Li-Polymer Replacement Battery (361-00135-01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1800mAh Li-Polymer replacement cell for the Garmin EDGE 1040 cycling GPS computer and the inReach Messenger. Both devices use OEM part number 361-00135-01. Fit the same physical cell — 48.00 × 42.60 × 6.20mm — with the same connector and BMS interface.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEDGE 1040 and inReach Messenger compatibility:\u003c\/strong\u003e\n    Both devices share the 361-00135-01 cell because they run the same 3.7V power rail and use an identical connector pinout. The BMS handshake protocol is the same across both platforms, so the replacement cell communicates charge state to each device without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on the EDGE 1040. The BMS reported accurate state-of-charge throughout, with no false low-battery triggers or premature cutoff events during GPS-active testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst satellite fix after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the EDGE 1040 fully on outdoors before your ride. A full power interruption clears the satellite almanac cache, so the device performs a cold start — expect 5–10 minutes for the first fix versus under a minute for subsequent warm starts once the almanac rebuilds.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the EDGE 1040\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen battery voltage drops toward the lower end of the 3.7V nominal range, the EDGE 1040 reduces GPS receiver sensitivity to conserve power. This shows up as a wider track scatter on the recorded ride file — switchbacks look rounded and elevation graphs develop staircase artefacts. The receiver is still locking onto satellites, but with fewer signals processed. Keeping the cell above 3.5V under load maintains full receiver sensitivity and cleaner track data.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEDGE 1040 shuts off without warning at the start of a descent\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the on-screen battery indicator reads 10–15% but the device cuts out immediately. An aged or deeply discharged cell develops higher internal resistance — under the momentary load spike of the GPS receiver processing rapid altitude and speed changes, terminal voltage drops below the BMS cutoff threshold faster than the indicator updates. The device shuts down before the visual warning fires. After fitting a fresh cell, do one full charge cycle to 4.2V so the fuel gauge recalibrates its cutoff curve to the new cell's actual capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377556324442,"sku":"BWCS-GMS135SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377556357210,"sku":"BWCS-GMS135SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377556389978,"sku":"BWCS-GMS135SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMS135SL-1.webp?v=1778771652"},{"product_id":"rand-mcnally-tnd-750-replacement-battery-37v-5000mah-li-polymer","title":"Rand McNally TND-750 GPS Replacement Battery 3.7V 5000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-750 — 3.7V Li-Polymer Replacement Battery (AHB865958)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 5000mAh Li-Polymer cell replaces the AHB865958 battery in the Rand McNally TND-750 GPS navigator. The TND-750 is a truck and automotive navigation device that runs on internal battery power when disconnected from a vehicle power source. Fit this cell when the original no longer holds a charge or the device shuts down unexpectedly during use.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-750 fit:\u003c\/strong\u003e\n    The AHB865958 is the sole internal cell for this navigator. Voltage, connector pinout, and physical dimensions — 61.00 × 58.20 × 8.20mm — match the original exactly, so the device's charging circuit and low-battery indicator read the new cell correctly from first boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge passes on the TND-750 platform. The BMS accepted the cell without error flags, and the charge circuit reached full cutoff voltage at 4.2V as expected.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the TND-750 on outdoors and let it acquire a satellite fix before driving. The GPS performs a cold start after any full power interruption — first fix typically takes 5–10 minutes, compared to under a minute on a warm start.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping at low battery on the TND-750\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome GPS units reduce receiver sensitivity as battery voltage drops, prioritising power conservation over signal strength. On the TND-750 this can show up as position drift or slower route recalculation near the end of a charge cycle. The fix is straightforward: keep the device charged above 20% during active navigation. If accuracy issues appear mid-route, connect the device to vehicle power — the GPS receiver will restore full sensitivity within a few seconds of stable voltage.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTND-750 shutting off without warning before the battery indicator hits empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a full battery swap, the TND-750's fuel gauge is uncalibrated — it has no charge history for the new cell. The device may cut power abruptly at what looks like 15–20% remaining because the low-battery threshold was mapped to the old, degraded cell's discharge curve. Run two full charge-to-discharge cycles to let the firmware recalibrate the indicator against the new cell's actual capacity. After that, the low-battery warning will trigger at the correct voltage, which is approximately 3.5V under load for this chemistry.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377556586586,"sku":"BWCS-RMT750SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377556619354,"sku":"BWCS-RMT750SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377556652122,"sku":"BWCS-RMT750SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMT750SL-1.webp?v=1778771668"},{"product_id":"garmin-fleet-670-lm-truck-replacement-battery-37v-1500mah-li-ion","title":"Garmin Fleet 670 LM Replacement Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGarmin Fleet 670 LM TRUCK — 3.7V Li-ion Replacement Battery (361-00066-51)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1500mAh Li-ion cell built to fit the Garmin Fleet 670 LM TRUCK GPS navigator. It replaces OEM part 361-00066-51 and restores power to the navigation system when the original cell has degraded. Voltage and connector match the original spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFleet 670 LM TRUCK platform fit:\u003c\/strong\u003e\n    The Fleet 670 LM TRUCK runs a single-cell 3.7V Li-ion architecture with a low-profile connector and BMS handshake tied to the OEM cell spec. This replacement matches that voltage rail and physical footprint — 64.42 × 41.90 × 5.10mm — so the device powers on and communicates normally with the cell from first boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Fleet 670 platform and confirmed the BMS accepted the cell without fault codes. Capacity held at rated 1500mAh across the test cycles and the device held satellite lock through the full session.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite fix after battery swap:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors and let it acquire a satellite fix before driving. The GPS performs a full cold start after any complete power interruption — first fix takes 5 to 10 minutes outdoors. Subsequent warm starts after normal shut-down will be under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Fleet 670 LM TRUCK shuts off without a low-battery warning\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Fleet 670 reads cell voltage to calculate the battery indicator on screen. After years of use, the original cell's internal resistance rises, causing voltage to sag under the GPS receiver and display load. The device hits its hardware low-voltage cutoff before the software indicator reaches the red zone, so the unit powers off mid-route with no visible warning. Fitting a new cell with lower internal resistance restores the voltage margin and the warning indicator behaves accurately again.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes and POIs missing after fitting the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome Fleet 670 settings and saved routes are held in battery-backed RAM, which loses state when the cell is fully removed. This is not a fault with the replacement battery — it is a consequence of any complete power interruption to that memory area. Re-enter saved routes and custom POIs manually after the swap. Going forward, use the device's export function to back up routes to the SD card before any battery service.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377556815962,"sku":"BWCS-GMF670SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377556848730,"sku":"BWCS-GMF670SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377556881498,"sku":"BWCS-GMF670SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMF670SL-1.webp?v=1778771652"},{"product_id":"garmin-zumo-replacement-battery-74v-920mah-li-ion","title":"Garmin Zumo 361-00063-00 Replacement Battery 7.4V 920mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGarmin Zumo Series — 7.4V Li-ion Replacement Battery (361-00063-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 920mAh Li-ion cell replaces the original battery in the Garmin Zumo motorcycle GPS navigator. It fits the Zumo series and matches the OEM voltage and connector spec. The Zumo draws continuous power for GPS acquisition, map rendering, and display backlight — all from this single cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eZumo series fit:\u003c\/strong\u003e\n    The Zumo line shares a common battery bay geometry and a 7.4V two-cell Li-ion configuration. This replacement matches that voltage rail and uses the same connector orientation. The onboard BMS communicates with the Zumo's charge circuit without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the Zumo's charge circuit and confirmed the BMS handshake completed correctly. The device accepted a full charge without triggering a fault state and the low-voltage cutoff fired at the expected threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this battery, power the Zumo on outdoors with a clear sky view and let it run a full cold-start fix before your first ride. A power interruption clears the satellite almanac cache — first fix after a swap takes 5–10 minutes; all subsequent warm starts return to under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Zumo shuts off without warning near the end of a charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Zumo reads state-of-charge from the cell's voltage curve. After years of cycling, the original battery's curve flattens — the device reads a healthy voltage right up until the cell drops sharply. A new cell restores a normal voltage slope, but the Zumo's fuel gauge needs a full discharge-recharge cycle to recalibrate its internal threshold. Until that cycle completes, abrupt shutoffs near the bottom of the charge bar are still possible. Run one full charge and discharge outdoors to reset the calibration.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes and POIs missing after battery replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Zumo stores routes, favourites, and some trip data in battery-backed memory. Removing the original battery for more than a few seconds can clear that volatile RAM. Data saved to the internal flash or an SD card survives the swap — but routes held only in active memory do not. Before pulling the old battery, export your routes to an SD card or sync to Garmin BaseCamp on a PC. Reimport after the new cell is seated and the device boots cleanly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377557831770,"sku":"BWCS-GMZ630SL-1","price":60.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377557864538,"sku":"BWCS-GMZ630SL-2","price":71.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377557897306,"sku":"BWCS-GMZ630SL-3","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMZ630SL-1.webp?v=1778771653"},{"product_id":"bmw-motorrad-navigator-v-replacement-battery-74v-920mah-li-ion","title":"BMW Motorrad Navigator V 7.4V Replacement Battery 361-00063-00","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBMW Motorrad Navigator V \/ VI — 7.4V Li-ion Replacement Battery (361-00063-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 920mAh Li-ion cell built to replace the original battery in the BMW Motorrad Navigator V and Navigator VI 6 Endurance GPS units. It fits the mounting footprint at 52.70 × 34.40 × 10.60mm and matches the OEM voltage rail the navigation board expects. Drop this in when the original cell no longer holds enough charge to complete a ride.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNavigator V and VI shared platform:\u003c\/strong\u003e\n    Both units run the same 7.4V two-cell Li-ion pack with the same connector and BMS handshake. The Navigator VI Endurance variant uses identical cell dimensions and voltage thresholds, so one part number covers both generations.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge passes on the Navigator V board. The BMS accepted the pack without fault flags, and the protection circuit held cutoff cleanly at the low-voltage threshold without tripping early.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after power removal:\u003c\/strong\u003e\n    After fitting this cell, power the GPS on outdoors before you ride. A full power interruption clears the warm-start cache, so the receiver runs a cold start — expect the first satellite fix to take 5–10 minutes. Subsequent power cycles lock in under a minute once the almanac is rebuilt.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Navigator V shuts off without warning at low battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Navigator V reads battery level from a voltage curve that the device calibrates over time. After a battery swap, that curve is out of sync with the new cell. The device may show two or three bars and then cut off seconds later because the shutdown threshold is hit before the indicator catches up. Run two or three full charge-discharge cycles to let the device re-calibrate the voltage-to-percentage mapping. After that, the low-battery warning will fire at the correct point — around 6.8V under load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes and POIs missing after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome Navigator V firmware versions hold recent route data and POI caches in battery-backed RAM rather than flash storage. A complete power removal — which happens during a battery swap — clears that volatile memory. Favourites stored to the internal flash partition survive, but unsaved tracks or recently imported POI sets may not. Before swapping the cell, export any active routes via the USB connection to a PC using the BMW Navigator software, then re-import after the new battery is fitted and the unit powers on cleanly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377558290522,"sku":"BWCS-GMZ630SL-1","price":60.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377558323290,"sku":"BWCS-GMZ630SL-2","price":71.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377558356058,"sku":"BWCS-GMZ630SL-3","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMZ630SL-1.webp?v=1778771653"},{"product_id":"igpsport-bsc100-replacement-battery-37v-700mah-li-polymer","title":"iGpsport BSC100 Replacement Battery 3.7V 700mAh AHB363450","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eiGpsport BSC100 \/ BSC100S — 3.7V Li-Polymer Replacement Battery (AHB363450)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 700mAh Li-Polymer cell replacing the original AHB363450 inside the iGpsport BSC100 and BSC100S handlebar-mounted cycling computers. It restores full power to the GPS receiver, display, and navigation functions after the original cell has lost capacity through repeated charge cycles. Dimensions are 52.20 × 34.70 × 4.20mm — verify against your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBSC100 and BSC100S compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, voltage rail, and connector orientation, which is why one cell covers both. The BMS inside each unit reads the same 3.7V nominal and 4.2V charge ceiling — no firmware difference affects battery acceptance between the two variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge cycle on a BSC100 unit and confirmed the BMS accepted the cell without fault flags, the charge curve hit 4.2V cleanly, and the GPS receiver powered on without reset loops.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start behaviour after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the device on outdoors before your first ride and let it acquire a satellite fix. A full power interruption forces a cold start — first fix can take 5–10 minutes while the unit rebuilds its satellite almanac. Subsequent warm starts drop that to under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes disappearing after a battery swap on the BSC100\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe BSC100 stores some session data and route segments in volatile memory backed by battery voltage. When the cell is fully removed, that memory loses power and the data is gone — this is a hardware limitation, not a fault with the replacement cell. Before swapping the battery, export any saved routes via the iGpsport app or USB connection to a computer. After fitting the new cell, re-sync routes from the app to restore them to the device.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBSC100 shutting off without warning before the battery indicator hits zero\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a full battery replacement, the fuel gauge inside the BSC100 is uncalibrated against the new cell's discharge curve. The unit's low-battery threshold was tuned to the aged original cell, so it can trigger an abrupt shutdown before the on-screen indicator shows critical. To recalibrate, run the new cell through two full charge and discharge cycles under normal GPS use. After that, the indicator tracking tightens and the visual warning fires with enough margin to save data and end navigation cleanly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377558683738,"sku":"BWCS-IGC100SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377558716506,"sku":"BWCS-IGC100SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377558749274,"sku":"BWCS-IGC100SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IGC100SL-1.webp?v=1778771652"},{"product_id":"rand-mcnally-tnd-70-replacement-battery-37v-3500mah-li-polymer","title":"Rand McNally TND-70 GPS Compatible Battery 3.7V 3500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-70 — 3.7V Li-Polymer Replacement Battery (MLP604582)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 3500mAh lithium-polymer cell replaces the original MLP604582 battery in the Rand McNally TND-70 GPS navigator. The TND-70 is a truck-focused navigation device with real-time traffic and route planning. Fitting this cell restores full power to the display, GPS receiver, and onboard storage.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-70 compatibility:\u003c\/strong\u003e\n    The TND-70 uses a single-cell Li-Polymer pack at 3.7V nominal. This replacement matches that voltage rail and the MLP604582 form factor — 83.00 × 44.80 × 5.70mm — so the cell seats correctly against the connector without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the TND-70 platform. The BMS accepted the cell without fault codes, charge termination triggered cleanly at 4.2V, and the low-voltage cutoff held at the expected threshold before shutdown.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after fitting:\u003c\/strong\u003e\n    After a full power interruption, the TND-70 loses its ephemeris data and must perform a cold start. Power the unit on outdoors in open sky and leave it stationary — first satellite fix typically takes 5 to 10 minutes. Subsequent warm starts drop to under a minute once the almanac rebuilds.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the TND-70 shuts off without showing a low-battery warning\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TND-70 reads battery state from a voltage curve calibrated to the original cell. When a degraded original battery is replaced, the fuel gauge has no reference point and may misread state-of-charge by a wide margin. The device hits its hardware cutoff voltage — around 3.0V — before the on-screen indicator reaches the empty icon. Running two full charge-discharge cycles recalibrates the curve and brings the warning back in line with actual capacity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes and custom POIs missing after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TND-70 stores user routes and points of interest in internal flash memory, not in battery-backed RAM, so a clean power removal does not erase them. If routes are missing after a swap, the more likely cause is a firmware reset triggered by the device detecting an unexpected power-on sequence. Navigate to Settings → Restore and check whether a factory reset flag was set during the power interruption. Re-importing routes from a saved backup file on the SD card or via the Rand McNally Dock software is the fastest recovery path.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377559994458,"sku":"BWCS-RMT700SL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377560027226,"sku":"BWCS-RMT700SL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377560059994,"sku":"BWCS-RMT700SL-3","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMT700SL-1.webp?v=1778771668"},{"product_id":"trail-tech-voyager-replacement-battery-37v-1100mah-li-polymer","title":"Trail Tech Voyager 9000-LIB Replacement Battery 3.7V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTrail Tech Voyager — 3.7V Li-Polymer Replacement Battery (9000-LIB)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1100mAh Li-Polymer cell replaces the original battery in the Trail Tech Voyager GPS navigator. It fits the Voyager directly using OEM part references 9000-LIB and 9000-B800. Voltage and capacity match factory spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVoyager platform fit:\u003c\/strong\u003e\n    The Voyager GPS uses a single Li-Polymer cell with a dedicated BMS that monitors cell voltage and temperature. This cell matches the voltage rail and connector pinout the onboard BMS expects — no adapter or modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on a Voyager unit. The BMS accepted the cell without fault codes, balanced charging kicked in correctly at the top of charge, and cutoff engaged cleanly at the low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the Voyager fully on outdoors before use. The unit performs a cold start after any full power interruption — allow 5 to 10 minutes for first satellite fix in open sky. Subsequent warm starts lock in under a minute once the almanac is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the Voyager\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the Voyager cell drops toward the low-voltage cutoff threshold, the unit reduces receiver sensitivity to protect remaining capacity. This shows up as fewer satellites in view and wider position error — sometimes 10 to 30 metres off track. It is not a fault with the GPS module itself. Charge the unit above 3.7V and the receiver returns to full sensitivity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoyager shutting off without a low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a full battery swap, the Voyager's fuel gauge needs a calibration cycle before its low-battery indicator reads correctly. Until that cycle completes, the displayed battery level can read 20–30% while the actual cell voltage is already near the BMS cutoff point — causing sudden shutdown with no visible warning. Run one full charge to 4.2V, then discharge in active navigation until the unit shuts off naturally. After that cycle, the indicator tracks actual charge level accurately.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377560354906,"sku":"BWCS-TRV900SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377560387674,"sku":"BWCS-TRV900SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377560420442,"sku":"BWCS-TRV900SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TRV900SL-1.webp?v=1778771669"},{"product_id":"twonav-aventura-500-replacement-battery-37v-5200mah-li-polymer","title":"TwoNav Aventura 500 Replacement Battery 3.7V 5200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTwoNav Aventura 500 — 3.7V Li-Polymer Replacement Battery (PL605056P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 5200mAh Li-Polymer cell replaces the original PL605056P battery in the TwoNav Aventura 500, Aventura, and Aventura Motor handheld GPS navigators. It fits the same footprint at 62 × 55 × 14mm and connects to the same BMS circuit. Capacity figure is from the product specification — 19.24Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAventura 500, Aventura, and Aventura Motor compatibility:\u003c\/strong\u003e\n    All three models share the same PL605056P cell format, voltage rail, and connector pinout. The BMS handshake is identical across the range, so one cell covers all three without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Aventura platform. The BMS accepted the cell without fault codes, held the 3.7V nominal rail cleanly, and cutoff triggered correctly at the low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors and let it acquire a full satellite fix before starting navigation. A complete power interruption forces a cold start — first fix can take 5–10 minutes in open sky versus under a minute for a warm start once almanac data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the Aventura 500\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAs cell voltage drops toward the low-voltage cutoff, some GPS units pull back receiver sensitivity to reduce current draw and extend operating time. On the Aventura platform, this can show as position drift or a weaker satellite signal count on the status screen. The fix is straightforward — a fresh cell at full charge restores the receiver to full sensitivity. If drift persists after a full charge, check that the antenna contact on the battery door is clean and seated flat.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAventura 500 shutting off without warning at the end of a charge cycle\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the battery indicator is uncalibrated against the new cell — the device hasn't mapped the new cell's discharge curve yet, so the low-battery warning doesn't trigger before the cutoff voltage is reached. The BMS cuts power at approximately 3.0V per cell to protect the Li-Polymer chemistry. Run two or three full charge-to-cutoff cycles and the on-screen indicator will track more accurately against the actual remaining capacity. After the second cycle, the warning should appear at least several minutes before shutdown.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377561895002,"sku":"BWCS-TVN500SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377561927770,"sku":"BWCS-TVN500SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377561960538,"sku":"BWCS-TVN500SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TVN500SL-1.webp?v=1778771669"},{"product_id":"twonav-aventura-2-replacement-battery-37v-5200mah-li-polymer","title":"TwoNav Aventura 2 Replacement Battery 3.7V 5200mAh PL165562","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTwoNav Aventura 2 — 3.7V Li-Polymer Replacement Battery (PL165562)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 5200mAh Li-Polymer cell replaces the original PL165562 battery in the TwoNav Aventura 2 rugged handheld GPS navigator. It fits the Aventura 2 specifically — not the Aventura 3 or Trail series. Confirm your model before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAventura 2 fitment:\u003c\/strong\u003e\n    The Aventura 2 uses a single-cell Li-Polymer pack at 3.7V nominal with a proprietary connector and BMS handshake tied to the device's power management IC. This cell matches the voltage rail and connector pinout so the device recognises the pack and enables charge control correctly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the Aventura 2 platform. The BMS accepted the pack without fault codes, balanced charge terminated cleanly at 4.2V, and the low-voltage cutoff tripped at the correct threshold before the device could enter an unrecoverable deep-discharge state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after fitting:\u003c\/strong\u003e\n    After a full power interruption from a battery swap, the Aventura 2 performs a GPS cold start. Take the device outdoors immediately after powering on and hold it with a clear sky view. First fix after a cold start takes 5–10 minutes; subsequent warm starts drop under a minute once almanac data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the Aventura 2\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the Aventura 2 battery drops below roughly 3.5V under load, the device's power manager reduces current to the GPS receiver module to protect the remaining charge. Lower receiver power means weaker signal processing, and positional accuracy can degrade noticeably — track points spread out and the position dot drifts even while stationary. This is not a software bug or antenna fault. Keeping the cell above 20% state of charge maintains full receiver sensitivity. If you are seeing accuracy drop mid-route, check the battery indicator and recharge before heading into terrain where track precision matters.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAventura 2 shuts off without warning before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter fitting a new cell, the Aventura 2's fuel gauge is uncalibrated against the actual discharge curve of the replacement pack. The device may show two or three bars remaining and cut off abruptly — this happens because the voltage-threshold trigger fires before the visual indicator has stepped down to match it. Run two or three full charge-discharge cycles in normal use to let the device re-learn the pack's actual voltage-to-capacity curve. After calibration, the shut-off warning appears at roughly 3.55V under load, which aligns with the one-bar indicator as expected.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377562222682,"sku":"BWCS-TVN200SL-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377562255450,"sku":"BWCS-TVN200SL-2","price":63.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377562288218,"sku":"BWCS-TVN200SL-3","price":70.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TVN200SL-1.webp?v=1778771669"},{"product_id":"navman-otanium-100-replacement-battery-37v-5600mah-li-ion","title":"Navman Otanium 100 GPS Replacement Battery 3.7V 5600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNavman Otanium 100 — 3.7V Li-ion Replacement Battery (800-332-2436)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 5600mAh Li-ion replacement battery for the Navman Otanium 100 portable GPS navigator. It matches OEM part number 800-332-2436 and fits directly into the Otanium 100 housing. Capacity is rated at 20.72Wh from the factory spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOtanium 100 fit:\u003c\/strong\u003e\n    The Otanium 100 runs on a single-cell 3.7V Li-ion pack with a specific connector and physical envelope — 209.10 × 34.40 × 34.40mm. This cell matches those dimensions and the battery management handshake the unit expects on power-up.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Otanium 100 platform and confirmed the BMS reported full charge correctly, with no false low-battery flags at any point in the discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start acquisition after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors and let it run until it acquires a satellite fix before driving. The GPS performs a full cold start after any complete power interruption — first fix after a swap typically takes 5–10 minutes. Subsequent warm starts are under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reducing at low charge on the Otanium 100\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs battery voltage drops toward the lower end of the discharge curve, some GPS units step down receiver sensitivity to conserve power. On the Otanium 100, this can show up as slower position updates or increased positional drift during active navigation. The GPS receiver is one of the highest-draw components in the unit — it competes with the backlit display for whatever charge remains. Keeping the battery above 3.5V under load is the practical threshold where receiver performance stays consistent.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOtanium 100 shutting off without warning before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the device's low-battery indicator threshold is not calibrated to the actual voltage curve of the new cell. The unit cuts off at the hardware protection floor before the software warning triggers visually. Running one full charge-to-cutoff cycle recalibrates the threshold. After that cycle, the low-battery warning should appear at least a few minutes before shutdown at 3.4–3.5V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377562714202,"sku":"BWCS-NVP100SL-1","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377562746970,"sku":"BWCS-NVP100SL-2","price":68.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377562779738,"sku":"BWCS-NVP100SL-3","price":75.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NVP100SL-1.webp?v=1778771652"},{"product_id":"weenect-silber-we401-replacement-battery-37v-1000mah-li-polymer","title":"Weenect Silber WE401 Replacement Battery 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eWeenect Silber WE401 — 3.7V Li-Polymer Replacement Battery (AHB523450)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1000mAh lithium-polymer cell replaces the original AHB523450 battery in the Weenect Silber WE401 GPS tracker. The Silber WE401 is a personal GPS tracking device — typically used for monitoring elderly or vulnerable individuals in real time. When the original cell degrades, charge cycles shorten noticeably before the device starts losing signal mid-track.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSilber WE401 fit:\u003c\/strong\u003e\n    The WE401 runs a single-cell Li-Polymer architecture at 3.7V nominal. This cell matches that voltage rail and the AHB523450 footprint — 51.20 × 33.70 × 5.00mm — so the BMS handshake completes without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the WE401 platform. The BMS accepted the cell without entering protection mode, and the tracker returned to active tracking state as expected after each cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the device fully on outdoors before first use. GPS trackers perform a cold start after any full power interruption — first satellite fix can take 5–10 minutes outdoors. Subsequent power cycles reacquire much faster once almanac data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the WE401 shuts off without warning before the battery indicator hits zero\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe WE401's fuel gauge is calibrated to the original cell's discharge curve. A degraded or replacement cell may have a slightly different voltage-drop profile under load. When the GPS receiver and cellular modem draw current simultaneously, voltage sags below the BMS cutoff threshold faster than the indicator tracks. The visual warning never fires because the cutoff trips first. To recalibrate, run two full charge-to-cutoff cycles so the firmware maps the new cell's discharge curve accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWE401 draining noticeably faster during active location updates than in standby\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIn standby, the WE401 pings location at longer intervals — the GPS receiver powers down between fixes. In active tracking mode, the receiver stays on continuously alongside the cellular radio transmitting updates. That combined load draws significantly more current than standby polling. If drain seems excessive even in standby, check the app's update frequency setting — reducing the ping interval from 30 seconds to 2 minutes drops the active-radio duty cycle substantially and extends time between charges.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377563009114,"sku":"BWCS-WNE401SL-1","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377563041882,"sku":"BWCS-WNE401SL-2","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377563074650,"sku":"BWCS-WNE401SL-3","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WNE401SL-1.webp?v=1778771669"},{"product_id":"tomtom-rider-400-replacement-battery-37v-2500mah-li-ion","title":"TomTom Rider 400 Compatible Battery 3.7V 2500mAh VF3W","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTomTom Rider 400 \/ 410 \/ 550 — 3.7V Li-ion Replacement Battery (VF3W)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 2500mAh Li-ion cell replaces the original VF3W battery in TomTom Rider 400, Rider 410, Rider 550, and Great Rides Edition GPS navigators. These are motorcycle-mounted units that run continuously through long rides — the original cell degrades faster than a handheld GPS because of vibration, heat from the mounting position, and near-constant screen-on navigation use. Capacity is 2500mAh (9.25Wh), matching OEM spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRider 400 \/ 410 \/ 550 platform:\u003c\/strong\u003e\n    All three models share the same cell housing, connector orientation, and BMS communication protocol. The VF3W part number covers the full range — voltage rail and contact pitch are identical across the lineup, so one cell fits all listed units.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles with the BMS active. The protection circuit responded correctly to over-charge and cell-temperature limits. No false cutoff events occurred during draw spikes from the GPS receiver and backlit display operating together.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after fitting:\u003c\/strong\u003e\n    After any full power interruption — including a battery swap — the Rider 400 loses its ephemeris data and performs a cold start. Take the unit outside and power it on before your ride. First satellite fix takes 5–10 minutes; warm starts after that are under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the Rider 400\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen cell voltage drops below roughly 3.5V, the Rider 400 reduces power to non-critical subsystems — and the GPS receiver sensitivity is one of them. The result is fewer satellites tracked, weaker signal lock, and occasional position jumps on the map. This is a firmware-level power-saving response, not a hardware fault. Keeping the battery above 3.6V under load maintains full receiver performance throughout a ride.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice shuts off without low-battery warning on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA worn or newly fitted cell can cause the Rider 400 to cut power abruptly before the on-screen battery indicator reaches the warning threshold. The indicator is calibrated against the original cell's discharge curve — a new cell with a slightly different internal resistance reads differently under load. To recalibrate, run two full charge-discharge cycles with the unit actively navigating. After two cycles, the indicator tracks actual voltage accurately and warning appears at the correct point around 3.4V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377563697242,"sku":"BWCS-TMR410SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377563730010,"sku":"BWCS-TMR410SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377563762778,"sku":"BWCS-TMR410SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TMR410SL-1.webp?v=1778771669"},{"product_id":"bosch-nyon-replacement-battery-37v-700mah-li-ion","title":"Bosch Nyon S6EA Compatible Battery 3.7V 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBosch Nyon Bordcomputer — 3.7V Li-ion Replacement Battery (S6EA)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 700mAh Li-ion cell replaces the internal battery in the Bosch Nyon and Nyon Bordcomputer e-bike display units. The Nyon combines GPS navigation, speed tracking, and e-bike system control in a single handlebar-mounted unit. When the original cell degrades, the display loses power, drops navigation mid-ride, or fails to hold a charge between uses.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNyon and Nyon Bordcomputer compatibility:\u003c\/strong\u003e\n    Both variants run from the same 3.7V cell with the same connector footprint and BMS communication protocol. The S6EA part number covers both. Physical dimensions are 40.00 × 31.10 × 5.90mm — measure your original before fitting if yours is a modified or third-party Nyon housing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Nyon platform, confirming the BMS accepted the cell without fault codes, and that the display powered on cleanly through the boot sequence with GPS and navigation functions active.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation satellite acquisition:\u003c\/strong\u003e\n    After fitting this cell, power the Nyon fully on outdoors before your first ride. A cold start after full power removal takes 5–10 minutes for initial satellite fix. Subsequent warm starts drop back under a minute once the unit has stored recent ephemeris data.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Nyon shuts off without a low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Nyon reads battery percentage from a fuel gauge calibrated to the original cell's discharge curve. A degraded or replaced cell with a slightly different curve causes the gauge to read incorrectly — the unit reports 20% remaining, then hits the hardware cutoff voltage and shuts off without warning. The fix is to run two or three full charge-to-discharge cycles after fitting the new cell. This allows the fuel gauge to recalibrate against the actual discharge curve and restore accurate percentage readings.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes missing after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Nyon stores some route and settings data in RAM that is held by the battery. A full power-down during battery removal clears this volatile memory. Downloaded routes stored in flash memory survive the swap, but any unsaved in-progress routes or recently added POIs may not. Before opening the unit, sync your routes to the Bosch eBike Connect app — this ensures everything is backed up and can be pushed back to the device after the new cell is fitted.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377564090458,"sku":"BWCS-BRN600SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377564123226,"sku":"BWCS-BRN600SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377564155994,"sku":"BWCS-BRN600SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BRN600SL-1.webp?v=1778771652"},{"product_id":"rand-mcnally-tnd-740c-replacement-battery-37v-2000mah-li-polymer","title":"Rand McNally TND-740C GPS Replacement Battery MLP454094 3.7V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-740C — 3.7V Li-Polymer Replacement Battery (MLP454094)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 2000mAh Li-Polymer cell replaces the MLP454094 battery in the Rand McNally TND-740C truck GPS navigator. It restores portable power to the unit when the original cell has degraded and can no longer maintain sufficient voltage during active navigation. Dimensions are 86.20 × 39.00 × 4.60mm — measure your original before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-740C platform fit:\u003c\/strong\u003e\n    The TND-740C uses a flat LiPo pouch cell at this exact footprint and voltage rail. Swapping to a cell outside this voltage window will cause the unit's power management circuit to reject the battery or report incorrect charge state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the TND-740C and confirmed the BMS accepts the cell without fault flags, reports charge state correctly, and holds the protection circuit within expected cutoff thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this battery, power the TND-740C on outdoors before driving. The unit performs a cold start after any full power interruption — first satellite fix can take 5–10 minutes. Subsequent warm starts drop to under a minute once almanac data is re-cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the TND-740C\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen cell voltage drops toward the lower cutoff threshold, the TND-740C reduces power to the GPS receiver to extend operating time. This lowers receiver sensitivity and can cause position drift or loss of fix in areas with marginal signal — tunnels, urban canyons, dense tree cover. The fix is straightforward: charge the battery before use if navigation accuracy matters. A fully charged 3.7V LiPo cell holds around 4.2V at the terminals — that's the operating range where the receiver runs at full sensitivity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTND-740C shutting off without low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a battery swap, the TND-740C's fuel gauge needs one full charge and discharge cycle to recalibrate its voltage-to-capacity mapping. Until that cycle runs, the unit may display 20–30% charge remaining and cut off without warning — the displayed percentage is wrong, not the battery. Run the device from full charge down to automatic shutoff once, then charge fully again. After that cycle, the on-screen indicator tracks actual cell voltage correctly and low-battery warnings appear at the expected threshold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377564516442,"sku":"BWCS-RMT741SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377564549210,"sku":"BWCS-RMT741SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377564581978,"sku":"BWCS-RMT741SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMT741SL-1.webp?v=1778771668"},{"product_id":"rand-mcnally-tnd-720-replacement-battery-37v-1500mah-li-polymer","title":"Rand McNally TND-720 Compatible Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-720 — 3.7V Li-Polymer Replacement Battery (MLP643956)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1500mAh Li-Polymer cell that replaces the original MLP643956 battery in the Rand McNally TND-720 truck GPS navigator. It fits the TND-720 directly, restoring power to the portable navigation unit. Voltage and cell dimensions match the original: 56.80 × 38.20 × 6.40mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-720 fit confirmation:\u003c\/strong\u003e\n    The TND-720 uses a single flat Li-Polymer pouch cell on a 3.7V rail. This replacement matches that rail voltage and the connector orientation so the BMS handshake completes without error codes on startup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the TND-720 platform. The onboard BMS accepted the cell, reported accurate charge state, and held voltage above the low-battery cutoff threshold through a complete navigation session.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the TND-720 on outdoors with a clear sky view before your first drive. A full power interruption clears the GPS receiver's warm-start cache, so the first satellite fix takes 5–10 minutes. Subsequent fixes return to under a minute once the almanac data is rebuilt.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the TND-720\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen cell voltage drops toward 3.4V, the TND-720 reduces power to the GPS receiver module to extend operation. Lower receiver power means weaker signal processing, which can cause position drift or delayed map updates during active navigation. This is a firmware-level power management decision, not a hardware fault. Keeping the unit plugged into the truck's 12V outlet during navigation eliminates the issue entirely — the battery then acts as a backup rather than the primary power source.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTND-720 shuts off without warning before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a battery swap, the TND-720's fuel gauge IC needs one full charge-discharge cycle to recalibrate its voltage-to-capacity curve. Until that cycle runs, the displayed charge percentage can read 15–20% while the actual cell voltage is already at the hard cutoff threshold of approximately 3.0V. The device then shuts off with no visual warning. Run one complete charge from flat to full after fitting this cell to resync the gauge, and the low-battery warning will appear at the correct point going forward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377565204570,"sku":"BWCS-RMT720SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377565237338,"sku":"BWCS-RMT720SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377565270106,"sku":"BWCS-RMT720SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMT720SL-1.webp?v=1778771668"},{"product_id":"rand-mcnally-tnd-510-replacement-battery-37v-950mah-li-polymer","title":"Rand McNally TND-510 GPS Replacement Battery 3.7V 950mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-510 \/ TND-530 Series — 3.7V Li-Polymer Replacement Battery (EU504046P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 950mAh lithium-polymer cell replaces the OEM battery in the Rand McNally TND-510, TND-520, TND-525, and TND-530 truck GPS navigators. It matches the original EU504046P spec and fits the same battery bay without modification. Capacity is 950mAh (3.52Wh), identical to the factory cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-510 through TND-530 compatibility:\u003c\/strong\u003e\n    These four navigators share the same battery bay dimensions, connector pinout, and voltage rail. The EU504046P part number covers all four models, so one cell fits the full series without any wiring or connector changes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the TND platform and monitored BMS cutoff behaviour. The protection circuit held within spec at both ends of the voltage range — no premature cutoff and no overcharge pass-through.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this battery, power the unit on outdoors and let it acquire a full satellite fix before driving. The TND-510 performs a cold start after any complete power interruption — first fix can take 5–10 minutes outdoors, compared to under a minute for a warm start once GPS almanac data is rebuilt.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced when the battery charge drops low\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TND-510's GPS receiver draws continuous power to maintain satellite lock and process positioning data. At low charge, some units reduce receiver sensitivity to stay within the power budget, which can degrade fix accuracy or cause brief signal drops. This is a firmware-level power management decision, not a hardware fault. Keeping the unit charged above 20% during active navigation avoids this threshold.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes and custom POIs missing after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TND series stores some user data in battery-backed RAM, which loses its state when power is fully removed. Swapping the battery counts as a complete power interruption, so custom POIs and saved routes may not survive the swap. Rand McNally's TND desktop software can back up route data before you open the unit. Export your routes via the software first, then restore after the new cell is fitted and the device boots cleanly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377565696090,"sku":"BWCS-RMD510SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377565728858,"sku":"BWCS-RMD510SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377565761626,"sku":"BWCS-RMD510SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMD510SL-1.webp?v=1778771668"},{"product_id":"rand-mcnally-tnd-t80b-replacement-battery-37v-4000mah-li-polymer","title":"Rand McNally TND-T80B GPS Replacement Battery 3.7V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-T80B \/ TND-T80A — 3.7V Li-Polymer Replacement Battery (MLP3770110)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 4000mAh Li-Polymer cell replaces part number MLP3770110 in the Rand McNally TND-T80B and TND-T80A truck GPS navigators. Both units share the same battery bay dimensions and connector pinout. Capacity comes straight from the product data — 4000mAh, 14.8Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-T80B and TND-T80A compatibility:\u003c\/strong\u003e\n    Both models run the same voltage rail and use the same MLP3770110 footprint. The BMS handshake is identical across the two, so one cell covers either unit without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the bench. The BMS held the charge cutoff at 4.2V and the low-voltage protection triggered cleanly before cell voltage dropped below safe floor. No thermal events observed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite fix after power interruption:\u003c\/strong\u003e\n    After fitting this cell, power the GPS fully on outdoors before driving. A full power removal clears the receiver's ephemeris cache, triggering a cold start. First satellite acquisition can take 5–10 minutes in open sky — subsequent warm starts run under a minute once that data is rebuilt.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping at low battery on the TND-T80B\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen cell voltage sags toward the low-voltage threshold, some GPS receivers reduce RF receiver sensitivity to cut power draw. On the TND-T80B, this shows up as position drift or a wider accuracy radius on the map — the satellite count stays the same but signal processing is degraded. Keeping the unit plugged into the cab's 12V supply during active navigation prevents this entirely. If running on battery only, watch for accuracy changes when the battery indicator hits the last segment.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTND-T80B shuts off without warning before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the on-device fuel gauge is no longer calibrated to the actual cell. After a full battery swap, the gauge has no historical charge data to reference and can underestimate remaining capacity — or overestimate it, letting the device run until the BMS hard-cuts at minimum voltage. Run two or three full charge-to-cutoff cycles after fitting the new cell. This lets the firmware re-learn the cell's actual discharge curve and align the low-battery warning to trigger before the hard cutoff at 3.0V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377565925466,"sku":"BWCS-RMT800SL-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377565958234,"sku":"BWCS-RMT800SL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377565991002,"sku":"BWCS-RMT800SL-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMT800SL-1.webp?v=1778771668"},{"product_id":"skygolf-skycaddie-sx400-replacement-battery-38v-3750mah-li-polymer","title":"SkyGolf SkyCaddie SX400 Compatible Battery 3.8V 3750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSkyGolf SkyCaddie SX400 — 3.8V Li-Polymer Replacement Battery (U744379PV)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V 3750mAh Li-Polymer cell replaces part number U744379PV in the SkyGolf SkyCaddie SX400 handheld golf GPS. The SX400 displays yardages, hazard distances, and course maps during a round. Swapping this cell restores full function when the original no longer holds a charge through 18 holes.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSkyCaddie SX400 fit:\u003c\/strong\u003e\n    The SX400 uses a single-cell Li-Polymer pack at 3.8V nominal with a proprietary connector and BMS handshake tied to the unit's power management IC. This replacement matches that voltage rail and connector pinout exactly — the BMS communicates correctly on power-up without triggering a fault state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the SX400 platform. The BMS accepted the cell, reported state-of-charge accurately across the charge curve, and did not trip the low-voltage cutoff prematurely during GPS-active discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-power tip after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the SX400 on outdoors and let it acquire a satellite fix before heading out. The unit performs a cold start after any full power interruption — first fix can take 5–10 minutes outdoors. Subsequent warm starts are under a minute once almanac data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the SX400\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SX400 scales back receiver sensitivity when cell voltage drops below a set threshold to reduce current draw and extend screen-on time. At reduced sensitivity, the unit may show a weaker satellite signal, causing yardage readings to jitter or update slowly. This is a firmware-level power decision, not a GPS hardware fault. Keeping the cell above 3.5V under load prevents the receiver from stepping down.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSX400 shuts off without warning before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a battery swap, the SX400's fuel gauge needs a full charge-to-discharge cycle to recalibrate its voltage-to-capacity mapping. Until that cycle completes, the unit's state-of-charge estimate runs ahead of actual cell voltage — the display still shows one bar when the cell voltage has already hit the cutoff threshold. The fix is one full charge from flat to 100% without interruption. After that conditioning cycle, the low-battery warning and shutoff threshold realign correctly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377566679130,"sku":"BWCS-SGX400SL-1","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377566711898,"sku":"BWCS-SGX400SL-2","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377566744666,"sku":"BWCS-SGX400SL-3","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SGX400SL-1.webp?v=1778771669"},{"product_id":"rand-mcnally-tnd-t85-replacement-battery-37v-4000mah-li-polymer","title":"Rand McNally TND-T85 Replacement Battery 3.7V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-T85 — 3.7V Li-Polymer Replacement Battery (OP806363)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 4000mAh Li-Polymer cell replaces the original OP806363 battery in the Rand McNally TND-T85 truck GPS navigator. It also fits the OD7, OD8, and PRO II 2 models, which share the same battery footprint and connector. Capacity figures come from the product data: 4000mAh \/ 14.8Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-T85, OD7, OD8, PRO II 2 compatibility:\u003c\/strong\u003e\n    These four Rand McNally units run the same 3.7V power rail, use the same physical connector, and share the OP806363 cell dimensions — 65.00 × 61.50 × 7.80mm. No adapter or rewiring needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the TND-T85 platform. The BMS accepted the cell without fault codes, and the charge circuit cycled cleanly to full capacity.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst satellite fix after power interruption:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors and let it acquire a satellite fix before driving. A cold start after full power removal takes 5–10 minutes for first lock — normal behaviour. Subsequent warm starts return to under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the TND-T85 battery indicator drops fast under active navigation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TND-T85 runs its GPS receiver, cellular traffic module, and backlit display simultaneously during active navigation. That combined draw pulls significantly more current than standby. An ageing or degraded original cell hits its voltage-sag threshold faster under load, so the indicator collapses quickly even from a full charge. A fresh 4000mAh cell restores the headroom needed to sustain that multi-component load without premature sag.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTND-T85 shuts off without warning before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge calibration drifts after battery replacement. The device's charge indicator is calibrated to the original cell's discharge curve — a new cell may present a slightly different curve, and the unit cuts power before the visual warning triggers. To recalibrate, run the battery down to automatic shut-off twice, then charge uninterrupted to 100% each time. After two full cycles the indicator tracks accurately to the cell's actual 3.7V nominal floor.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377567334490,"sku":"BWCS-RMT850SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377567367258,"sku":"BWCS-RMT850SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377567400026,"sku":"BWCS-RMT850SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMT850SL-1.webp?v=1778771668"},{"product_id":"rand-mcnally-tnd-550-replacement-battery-37v-1000mah-li-polymer","title":"Rand McNally TND-550 GPS Compatible Battery 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-550 \/ TND-540 — 3.7V Li-Polymer Replacement Battery (TOP 523450)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1000mAh lithium-polymer cell replaces the original TOP 523450 battery in the Rand McNally TND-550 and TND-540 trucking GPS navigators. It restores off-vehicle operation when the factory cell no longer holds a charge. Capacity is 1000mAh (3.7Wh) — matched to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-550 and TND-540 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay geometry, connector pinout, and 3.7V supply rail. The TOP 523450 part number covers both, so one cell fits either unit without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the TND platform. The BMS accepted the cell without error flags, and the charge circuit terminated correctly at full voltage. No swelling or thermal anomaly was observed during the test run.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this battery, power the unit on outdoors before driving. The TND-550 performs a GPS cold start following a full power interruption — first satellite fix can take 5–10 minutes. Subsequent warm starts drop that to under a minute once almanac data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the TND-550\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAs the Li-Polymer cell drops toward its lower voltage threshold, some TND units reduce GPS receiver sensitivity to conserve power. This shows up as position drift or a delayed position update on the map, even on open roads with clear sky view. The fix is not a settings change — it is voltage. Keeping the cell above 3.6V under load maintains full receiver operation. Charge the unit or connect to vehicle power before the battery indicator reaches its last bar.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTND-550 shutting off without a low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter an aged battery is replaced, the fuel gauge IC on the TND-550 is still calibrated to the old cell's discharge curve. The device's low-battery threshold can trigger later than expected — or not at all — causing an abrupt shutdown mid-route. This is not a fault with the new cell. Run two or three full charge-to-discharge cycles to allow the gauge to recalibrate. After the third cycle, the warning LED and on-screen indicator should align with the actual remaining voltage, which reads approximately 3.5V at the cutoff point.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377567432794,"sku":"BWCS-RMD550SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377567465562,"sku":"BWCS-RMD550SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377567498330,"sku":"BWCS-RMD550SL-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMD550SL-1.webp?v=1778771668"},{"product_id":"rand-mcnally-tnd-730-replacement-battery-37v-1600mah-li-polymer","title":"Rand McNally TND-730 Replacement Battery 3.7V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-730 \/ TND-720 — 3.7V Li-Polymer Replacement Battery (EU074160P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1600mAh Li-Polymer cell built to the EU074160P specification. It fits the Rand McNally TND-730 and TND-720 GPS truck navigators. Voltage and connector match the original exactly, so the device powers on without modification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-730 and TND-720 compatibility:\u003c\/strong\u003e\n    Both units share the same battery bay dimensions, connector pinout, and 3.7V supply rail. One cell fits both. The BMS logic in each device reads the same charge termination signal, so charge cycles complete normally on either model.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on the TND platform. The BMS accepted the cell without fault codes, charge termination triggered at the correct upper voltage, and low-battery cutoff engaged at the expected threshold — no premature shutdowns.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors and let it run until it acquires a full satellite fix before driving. GPS navigators perform a cold start after any complete power interruption — the almanac and ephemeris data stored in RAM is cleared, so the first fix can take 5–10 minutes outdoors with a clear sky view.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the TND-730 shuts off without a low-battery warning\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TND-730 uses a voltage-threshold system to trigger its battery indicator. As an original cell ages, its actual capacity drops while the device's shutdown threshold stays fixed. The fuel gauge reads the voltage curve, not true capacity, so the device can jump from showing two bars to cutting off — skipping the warning stage entirely. After fitting a new cell, run two or three full charge and discharge cycles to let the device recalibrate its voltage-to-capacity mapping and restore accurate indicator behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes and POIs missing after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome user data on the TND-730 — including saved routes and custom POIs — is held in battery-backed RAM. When the battery is fully removed, that RAM loses power and the stored data is cleared. This is normal behaviour and not a fault with the replacement cell. Before swapping the battery, export any saved routes via the Rand McNally Dock software on a PC, then re-import them after the new cell is fitted and the device has booted fully.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377568514138,"sku":"BWCS-RMD730SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377568546906,"sku":"BWCS-RMD730SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377568579674,"sku":"BWCS-RMD730SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMD730SL-1.webp?v=1778771668"},{"product_id":"spot-spot-x-replacement-battery-38v-3400mah-li-polymer","title":"SPOT X Satellite Messenger Compatible Battery 3.8V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSPOT X \/ SPOTXB — 3.8V Li-Polymer Replacement Battery (704476B B10)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V 3400mAh Li-Polymer cell replaces the original 704476B B10 battery in the SPOT X and SPOTXB satellite communicators. It powers the device's GPS receiver, two-way messaging radio, and emergency SOS transmitter. Capacity matches the original at 3400mAh (12.92Wh) — no compromise on the power budget these functions depend on.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSPOT X and SPOTXB compatibility:\u003c\/strong\u003e\n    Both units share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 704476B B10 part number covers both variants — no hardware modification needed to fit either device.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the SPOT X's full operating sequence — GPS acquisition, satellite message send, and SOS standby mode. The BMS held cutoff voltage correctly and the device drew consistent current across all three states without triggering a protection event.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start reset after fitting:\u003c\/strong\u003e\n    After installing this cell, take the device outdoors to an open sky and power it on before your next expedition. A full power interruption forces a GPS cold start — first satellite fix takes 5–10 minutes. Subsequent warm starts drop back under a minute once almanac data is rebuilt.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SPOT X shuts off without warning at low battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SPOT X uses a fuel gauge IC that reads remaining capacity based on a stored charge curve. When that curve drifts — common after the original cell degrades — the on-screen percentage no longer matches actual cell voltage. The device hits the hardware cutoff at roughly 3.2V before the visual low-battery indicator fires. Fitting a fresh cell and running two full discharge cycles recalibrates the gauge so the warning appears when it should.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping off during active tracking sessions\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome GPS units reduce receiver sensitivity as cell voltage falls toward the cutoff threshold — a power-saving measure built into the chipset. On the SPOT X, this shows up as position drift or wider error circles during long tracking sessions when the battery is below roughly 3.5V. The GPS and satellite modem are the two heaviest draws in the device, and they compete for current headroom on a degraded cell. A fresh 3400mAh cell restores the voltage headroom both subsystems need to run at full sensitivity simultaneously.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377568972890,"sku":"BWCS-SPT100SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377569005658,"sku":"BWCS-SPT100SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377569038426,"sku":"BWCS-SPT100SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SPT100SL-1.webp?v=1778771669"},{"product_id":"serioux-urban-pilot-upq700-replacement-battery-37v-1500mah-li-polymer","title":"SERIOUX URBAN PILOT UPQ700 Replacement Battery HR504080 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSERIOUX Urban Pilot UPQ700 — 3.7V Li-Polymer Replacement Battery (HR504080)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1500mAh Li-Polymer cell replaces the original HR504080 battery in the SERIOUX Urban Pilot UPQ700 portable GPS navigator. It restores power to the unit when the original cell no longer holds a charge or fails to power the device on. Capacity is 5.55Wh at the same voltage as the factory cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUPQ700 fit:\u003c\/strong\u003e\n    The UPQ700 uses a flat Li-Polymer pouch cell on a 3.7V rail. This HR504080 cell matches the original footprint at 60.00 × 37.40 × 5.40mm, so the connector seats correctly and the cell sits flat in the housing without pressure on the screen assembly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on a GPS navigator platform. The BMS accepted charge from a standard 5V USB input without fault flags, and the protection circuit triggered cleanly at low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after fitting:\u003c\/strong\u003e\n    After a full power removal, the UPQ700 loses its satellite ephemeris data and performs a cold start. Take the unit outdoors after fitting this battery and allow 5–10 minutes for the first satellite fix. Subsequent warm starts will lock in under a minute once the almanac is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping as battery level falls on the UPQ700\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome GPS navigators reduce RF receiver sensitivity at low battery to cut power draw. On the UPQ700, this can cause position drift or slower route recalculation before the device shuts off. A degraded original cell reaches the low-battery threshold sooner, compressing the window of full-accuracy navigation. A fresh 1500mAh cell keeps the receiver running at full sensitivity for longer into each charge cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUPQ700 shuts off without warning before the battery indicator hits empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the original cell has aged enough that its actual capacity no longer matches the charge curve the device's fuel gauge was calibrated against. The navigator reads 30% remaining, but the real voltage drops below the cutoff threshold — around 3.0V — and the unit powers off mid-route. Replacing the cell resets this mismatch. After fitting the new battery, run two full charge-to-discharge cycles so the device can recalibrate its voltage-to-percentage mapping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377569103962,"sku":"BWCS-SUP700SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377569136730,"sku":"BWCS-SUP700SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377569169498,"sku":"BWCS-SUP700SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SUP700SL-1.webp?v=1778771669"},{"product_id":"navitel-ms700-replacement-battery-37v-1500mah-li-polymer","title":"Navitel MS700 GPS Compatible Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNavitel MS700 — 3.7V Li-Polymer Replacement Battery (HR504080)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1500mAh Li-Polymer cell replaces the OEM HR504080 battery in the Navitel MS700 GPS navigator. It fits the MS700's internal battery bay directly and restores full power to the navigation display, GPS receiver, and map storage. Capacity matches the original at 1500mAh (5.55Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMS700 platform fit:\u003c\/strong\u003e\n    The HR504080 cell is specific to the MS700's compact battery compartment — 60.00 × 37.40 × 5.40mm. The connector polarity and voltage rail match the MS700 power management circuit, so the device reads charge state correctly from first boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the MS700's charge and discharge circuit. The BMS held the cutoff threshold correctly and the device reported charge percentage without erratic jumps across the full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start after power interruption:\u003c\/strong\u003e\n    After fitting this cell, power the MS700 on outdoors and let it acquire a satellite fix before driving. The GPS performs a full cold start after any complete power removal — first fix takes 5–10 minutes. Subsequent warm starts drop back under a minute once almanac data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced as battery voltage drops on the MS700\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt low battery, the MS700 scales back receiver sensitivity to reduce current draw. This shows up as increased position scatter or a slower fix when the battery indicator is in the bottom quarter. The GPS receiver requires stable voltage to maintain full signal processing — a degraded original battery causes this even when the indicator reads 20–30%. A fresh HR504080 cell holds the voltage above the threshold the receiver needs for full sensitivity through most of its discharge curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMS700 shuts off without low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the battery's actual discharge curve no longer matches the voltage-to-percentage table the MS700 uses to estimate remaining charge. An aged cell loses voltage suddenly in the final 15–20% of capacity, so the device hits the hardware cutoff voltage — around 3.0V — before the software warning triggers. Replacing with a new HR504080 cell re-aligns the discharge curve to what the firmware expects. After fitting, run one full charge cycle to let the indicator recalibrate.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377569759322,"sku":"BWCS-SUP700SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377569792090,"sku":"BWCS-SUP700SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377569824858,"sku":"BWCS-SUP700SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SUP700SL-1.webp?v=1778771669"},{"product_id":"swing-caddie-sc300-replacement-battery-37v-4750mah-li-polymer","title":"Swing Caddie SC300 Replacement Battery 3.7V 4750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSwing Caddie SC300 — 3.7V Li-Polymer Replacement Battery (ET4968116PA)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 4750mAh Li-Polymer cell replaces the internal battery in the Swing Caddie SC300 portable golf launch monitor and trainer. It restores power to the unit's GPS receiver, display, and shot-tracking functions. OEM part number ET4968116PA confirms the correct cell for this device.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSC300 platform fit:\u003c\/strong\u003e\n    The SC300 uses a single flat Li-Polymer cell with a specific connector and BMS handshake. This replacement matches the 111 x 64 x 6mm cell geometry, the voltage rail, and the protection circuit spec the SC300 firmware expects — so charge state reporting on-screen stays accurate.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles with the SC300's BMS active. The protection circuit tripped correctly at both the low-voltage cutoff and the charge termination threshold — no false shutoffs, no runaway charge events.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use GPS initialisation:\u003c\/strong\u003e\n    After fitting this cell, power the SC300 fully on outdoors before your round. The unit performs a cold-start GPS acquisition after any full power interruption — allow 5 to 10 minutes for the first satellite fix. Subsequent warm starts lock on in under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced when the SC300 battery runs low\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SC300's GPS receiver draws more current during active satellite tracking than during standby. As cell voltage drops toward the lower end of the 3.7V nominal range, some GPS units reduce receiver sensitivity to protect the remaining charge budget. This shows up as yardage readings that refresh more slowly or jump between distances. Keeping the cell above 3.5V under load — which a new 4750mAh cell sustains longer — keeps the receiver running at full sensitivity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSC300 shuts off without warning instead of showing a low-battery alert\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge calibration drifts after a worn cell is replaced. The SC300's charge indicator was calibrated to the old cell's discharge curve, so it reads higher than the actual voltage until the new cell is fully cycled. The BMS hits its hardware cutoff — typically around 3.0V — before the on-screen warning fires. Run two full charge-to-discharge cycles outdoors and the indicator will recalibrate to the new cell's curve.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377569857626,"sku":"BWCS-SWC300SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377569890394,"sku":"BWCS-SWC300SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377569923162,"sku":"BWCS-SWC300SL-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SWC300SL-1.webp?v=1778771669"},{"product_id":"rand-mcnally-tnd-740-replacement-battery-37v-2200mah-li-polymer","title":"Rand McNally TND-740 GPS Replacement Battery 3.7V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRand McNally TND-740 — 3.7V Li-Polymer Replacement Battery (MLP454094)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2200mAh lithium-polymer cell replaces the original MLP454094 battery in the Rand McNally TND-740 trucking GPS navigator. It restores battery-powered operation for in-cab route guidance and waypoint tracking when the unit is disconnected from the vehicle's power outlet. Dimensions are 82.00 × 45.00 × 4.90mm — verify your original cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTND-740 platform fit:\u003c\/strong\u003e\n    The TND-740 uses a slim LiPo pouch cell on a 3.7V single-cell rail. The MLP454094 footprint is specific to this unit — the connector orientation and cell thickness both matter. Confirm your original part number before ordering.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the TND-740 platform. The protection circuit handled cutoff at the low-voltage threshold correctly, and the charge controller accepted the cell without fault flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start calibration after swap:\u003c\/strong\u003e\n    After fitting, power the unit on outdoors and let it acquire a satellite fix before driving. A full cold start after complete power removal takes 5–10 minutes for first lock. Subsequent warm starts drop to under a minute once the almanac data rebuilds.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the TND-740 shuts off without warning at low battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a replacement, the fuel gauge IC loses its calibration data and no longer accurately tracks state of charge. The battery indicator can show one bar remaining while the cell is already near the 3.0V cutoff threshold. The protection circuit then trips and the unit powers off abruptly — no low-battery warning fires. Run two or three full charge cycles to let the gauge recalibrate against the new cell's actual capacity curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy drops noticeably during active turn-by-turn navigation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt low state of charge, some GPS receivers reduce RF front-end sensitivity to conserve power — the TND-740 exhibits this behaviour below roughly 3.3V under load. Fewer satellites are tracked, HDOP rises, and position jumps increase. The fix is straightforward: keep the unit on the vehicle charger during active navigation, or charge the battery to full before a trip where the cable won't be connected. A fully charged cell holds the receiver at full sensitivity throughout the session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377570873434,"sku":"BWCS-RMT740SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377570906202,"sku":"BWCS-RMT740SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377570938970,"sku":"BWCS-RMT740SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMT740SL-1.webp?v=1778771669"},{"product_id":"mares-icon-hd-replacement-battery-37v-3350mah-li-ion","title":"Mares ICON HD Dive Computer Replacement Battery 3.7V 3350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMARES ICON HD \/ ICON Genius \/ Genius Air — 3.7V Li-ion Replacement Battery (44201389)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 3350mAh Li-ion cell replaces the OEM battery in the MARES ICON HD, ICON Genius, and Genius Air dive computers. These wrist-mounted units use the battery to power continuous depth tracking, dive logging, and GPS acquisition during and between dives. Capacity figure is taken directly from product data — 3350mAh, 12.4Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eICON HD, ICON Genius, and Genius Air shared platform:\u003c\/strong\u003e\n    All three models run the same 3.7V cell on the same connector and BMS handshake profile. The ICON Genius and Genius Air add air integration, but the power circuit is unchanged — one cell covers the full range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the ICON HD's logging and GPS acquisition states. The BMS held the charge curve cleanly, and the protection circuit tripped at the correct low-voltage threshold without false cutoff during GPS lock sequences.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after fitting:\u003c\/strong\u003e\n    After any full power removal, the GPS module loses its ephemeris data and performs a cold start. Take the computer outdoors and power it on fully before your first post-swap dive — first satellite fix takes 5–10 minutes. Subsequent warm starts resolve in under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the ICON HD shuts off without warning at low battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAfter an aged battery degrades, its internal resistance climbs. The cell voltage reads acceptable at rest but sags sharply the moment the GPS receiver or backlight draws current. The dive computer's low-battery indicator reads the rested voltage, not the load voltage — so the warning threshold is never triggered before the BMS cuts the cell to prevent over-discharge. A new cell with lower internal resistance holds voltage under load and restores accurate battery indicator behaviour. If the issue persists after swap, recalibrate the indicator by running three full charge-discharge cycles.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping as battery level falls\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ICON HD's GPS receiver draws peak current during active satellite tracking. At low state-of-charge, some firmware revisions throttle receiver sensitivity to protect the cell from undervoltage cutoff. The result is fewer satellites tracked and reduced position accuracy — showing up as drift on logged dive surface intervals or GPS waypoints. Fitting a fresh 3350mAh cell restores full receiver power budget. Confirm the fix by checking satellite count in the GPS status screen — a healthy unit should lock onto six or more satellites in open sky.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377571299418,"sku":"BWCS-MAR389XL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377571332186,"sku":"BWCS-MAR389XL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377571364954,"sku":"BWCS-MAR389XL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MAR389XL-1.webp?v=1778771653"},{"product_id":"mares-icon-hd-replacement-battery-37v-2600mah-li-ion","title":"Mares ICON HD Replacement Battery 3.7V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMARES ICON HD \/ ICON Genius Series — 3.7V Li-ion Replacement Battery (44201389)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2600mAh Li-ion cell replaces the original battery in the MARES ICON HD, ICON Genius, and Genius Air dive computers. These wrist-mounted units handle depth tracking, decompression calculations, and GPS surface navigation — all of which stop working when the cell dies. Voltage and capacity match the OEM spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eICON HD, ICON Genius, and Genius Air compatibility:\u003c\/strong\u003e\n    All three models share the same battery bay dimensions, connector pinout, and BMS handshake. The 44201389 and 44200755 part numbers cross-reference to the same cell — same voltage rail, same pack geometry, same communication protocol with the dive computer's charging circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the ICON HD platform. The BMS accepted full charge without error flags, and the device's battery indicator tracked correctly across the discharge curve from 4.2V down to the 3.0V cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after fitting:\u003c\/strong\u003e\n    After any full power removal, the GPS module loses its ephemeris data and performs a cold start. Power the device on outdoors with a clear sky view and allow 5–10 minutes for the first satellite fix. Subsequent warm starts will lock in under a minute once ephemeris is cached again.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the ICON HD battery indicator gives little warning before shutdown\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ICON HD reads battery state by sampling cell voltage, not a gas-gauge IC. A fresh cell holds voltage well through most of its discharge, then drops steeply in the final 10–15% of capacity. This means the on-screen percentage can read 20% and drop to cutoff quickly, especially under GPS-active load. After fitting a new cell, run one full charge-discharge cycle so the device calibrates its voltage-to-percentage mapping accurately. Until that cycle completes, the low-battery warning threshold may trigger later than expected.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved dive logs and routes disappearing after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ICON HD stores dive logs in onboard flash memory, which is non-volatile and survives a full power loss — logs should persist after a battery swap. GPS waypoints and surface routes, however, may be held in battery-backed SRAM on some firmware versions, and a complete power interruption can wipe them. Before removing the old cell, export any saved routes via the Mares dive management software. After fitting the new cell and completing the cold-start satellite fix, re-import your waypoints from the backup file.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377571954778,"sku":"BWCS-MAR389SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377571987546,"sku":"BWCS-MAR389SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377572020314,"sku":"BWCS-MAR389SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MAR389SL-1.webp?v=1778771653"},{"product_id":"roadmate-7771t-lmb-replacement-battery-37v-1500mah-li-polymer","title":"RoadMate 7771T-LMB GPS Navigator Replacement Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRoadMate 7771T-LMB \/ RM7771T-LMB — 3.7V Li-Polymer Replacement Battery (PL435058H)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1500mAh Li-Polymer replacement cell for the RoadMate 7771T-LMB and RM7771T-LMB portable GPS navigators. It matches the OEM part number PL435058H and fits the original battery bay without modification. Capacity figures come from the product data — 1500mAh \/ 5.55Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e7771T-LMB and RM7771T-LMB fit:\u003c\/strong\u003e\n    Both model designations run the same 3.7V single-cell Li-Polymer architecture with an identical connector and BMS handshake. The PL435058H cell at 59.00 × 45.70 × 3.80mm matches the cavity exactly — no adapter or modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a GPS navigator platform. The BMS accepted a standard 4.2V charge termination without error, and low-voltage cutoff triggered correctly before cell stress occurred.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell and powering on, take the device outdoors and leave it running. The GPS performs a cold start after any full power interruption — first satellite fix can take 5–10 minutes. Subsequent warm starts drop under one minute once almanac data rebuilds.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced as battery charge drops on the 7771T-LMB\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eSome portable GPS units scale back receiver sensitivity at low battery to reduce current draw. On the 7771T-LMB, this can appear as slower route recalculation or a wandering position dot — even when the device still shows a signal bar. The root cause is power management cutting the RF front end before the battery fully depletes. Keeping the cell above 3.6V during active navigation avoids this threshold. Plug in via USB or vehicle charger for long sessions rather than running the cell down.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice shuts off mid-navigation with no low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge calibration drifts — the device's voltage-threshold indicator never triggers the visual warning before the cell hits cutoff voltage. It is especially common after a battery replacement, because the new cell has a slightly different discharge curve than the aged original. The fix is a full recalibration cycle: charge to 100%, run the device on active navigation until it shuts off on its own, then charge uninterrupted back to 4.2V. One full cycle resets the threshold alignment.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377572216922,"sku":"BWCS-MRT777SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377572249690,"sku":"BWCS-MRT777SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377572282458,"sku":"BWCS-MRT777SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRT777SL-1.webp?v=1778771652"},{"product_id":"garmin-dezl-otr800-replacement-battery-37v-2000mah-li-polymer","title":"Garmin DEZL OTR800 Replacement Battery 3.7V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGarmin dēzl OTR800 Series — 3.7V Li-Polymer Replacement Battery (361-00109-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2000mAh lithium-polymer cell replaces the original battery in the Garmin dēzl OTR800, dēzl OTR800 MT-S, and Overlander GPS navigators. It matches the OEM dimensions of 61.00 × 49.30 × 6.00mm and connects directly to the existing battery connector inside the device. Swap it when the original cell no longer holds charge or shuts the unit off before the on-screen indicator reaches zero.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOTR800, OTR800 MT-S, and Overlander fit:\u003c\/strong\u003e\n    All three models share the same battery bay dimensions, connector pinout, and 3.7V supply rail, so a single cell covers the full group. The BMS on each device uses the same charge termination voltage, so no firmware differences affect charging behaviour.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the OTR800 platform. The BMS accepted charge at the standard CC\/CV profile, terminated cleanly at 4.2V, and held the low-voltage cutoff at approximately 3.0V without tripping early.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after power interruption:\u003c\/strong\u003e\n    After fitting this cell, power the navigator on outdoors before driving. The dēzl OTR800 performs a cold start after any full power removal — allow 5 to 10 minutes for first satellite fix before relying on turn-by-turn directions.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced when battery charge drops below 20%\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt low state of charge, the dēzl OTR800 reduces power to the GPS receiver to extend operation. This drops satellite sensitivity, which can widen position error — noticeable when navigating tight truck routes near restricted roads. A degraded original cell sitting at low voltage all day triggers this mode more often than a fresh cell would. Replacing the battery and keeping charge above 20% during active navigation keeps the receiver running at full sensitivity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003edēzl OTR800 shuts off without showing a low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the original cell has aged enough that its actual capacity no longer matches the fuel gauge calibration. The device reads 30% remaining but the real voltage collapses to the 3.0V cutoff threshold under load, triggering an immediate shutdown. It is not a firmware fault — the indicator is simply reading a worn cell inaccurately. Fit the new cell, charge to 100%, then run one full discharge cycle so the fuel gauge recalibrates against the fresh capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377572380762,"sku":"BWCS-GMR800SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377572413530,"sku":"BWCS-GMR800SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377572446298,"sku":"BWCS-GMR800SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMR800SL-1.webp?v=1778771652"},{"product_id":"polar-v650-replacement-battery-37v-1400mah-li-polymer","title":"Polar V650 GPS Watch Compatible Battery 3.7V 1400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePolar V650 — 3.7V Li-Polymer Replacement Battery (G484466P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1400mAh Li-Polymer cell built to the G484466P specification for the Polar V650 GPS cycling computer. It replaces the original cell when capacity has dropped to the point where the V650 can no longer sustain a full ride. Voltage and physical dimensions match the factory spec: 55.80 × 41.60 × 5.00mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eV650 platform fit:\u003c\/strong\u003e\n    The V650 uses a flat Li-Polymer pouch cell with a specific connector orientation tied to the unit's charge management circuit. Swapping to a cell of incorrect thickness or capacity will cause fit problems or trigger the BMS to refuse charging entirely.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on a V650 unit. The BMS accepted the cell without fault flags, charge termination triggered correctly at 4.2V, and the low-voltage cutoff fired at the expected threshold without premature shutdown.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the V650 fully on outdoors before your first ride. GPS performs a cold start after any complete power interruption — budget 5 to 10 minutes for first satellite fix outdoors rather than the sub-minute warm start you had before the swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eV650 GPS accuracy dropping at low battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe V650 GPS receiver draws consistent current to maintain satellite lock, but at low cell voltage the unit can reduce receiver sensitivity to protect remaining charge. This shows up as position drift or wider track scatter on climbs and descents where signal is already weaker. A degraded original cell that sags to 3.4V or below under GPS load will trigger this behaviour even when the on-screen indicator still shows one bar. Fitting a fresh cell and keeping it above 3.6V under load restores full receiver sensitivity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eV650 shutting off without a low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge calibration drifts after a battery swap — the V650 reads remaining capacity from voltage curve data stored from the old cell. A fresh cell with a slightly different discharge curve can cause the indicator to read 20% while the actual voltage is already near cutoff. The fix is a full calibration cycle: charge to 100%, ride until the unit shuts off under GPS load, then charge uninterrupted back to 100%. After one full cycle the voltage-to-capacity mapping recalibrates and the warning fires at the correct threshold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377572675674,"sku":"BWCS-PLV650SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377572708442,"sku":"BWCS-PLV650SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377572741210,"sku":"BWCS-PLV650SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLV650SL-1.webp?v=1778771653"},{"product_id":"becker-transit-7sl-eu-replacement-battery-37v-1600mah-li-polymer","title":"Becker Transit 7SL EU Replacement Battery 3.7V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBecker Transit 7SL EU — 3.7V Li-Polymer Replacement Battery (EU554751P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1600mAh Li-Polymer cell replaces the internal battery in the Becker Transit 7SL EU portable GPS navigator. It fits the Transit 7SL EU dashboard navigation unit used for European road guidance. Swap it when the original cell no longer holds a charge or causes the device to shut down mid-route.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTransit 7SL EU fit:\u003c\/strong\u003e\n    The Transit 7SL EU uses a flat Li-Polymer pouch cell on a 3.7V single-cell rail. This replacement matches the OEM cell dimensions at 52.50 × 42.50 × 6.00mm and uses compatible part references EU554751P, SR584450P, and Y16GCGAA1. The connector and BMS communication are unchanged from the original configuration.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on GPS-class load profiles. The BMS held the low-voltage cutoff correctly and did not trip early under the combined draw of the GPS receiver and display backlight at full brightness.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst fix after installation:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors in open sky. The Transit 7SL EU performs a cold start after any full power interruption — expect the first satellite fix to take 5–10 minutes. Subsequent warm starts drop well under a minute once almanac data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the Transit 7SL EU\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs the cell voltage drops toward the low-voltage threshold, the Transit 7SL EU can reduce RF receiver sensitivity to conserve power. This shows up as position drift or a weaker satellite count on the signal bar. It is not a GPS antenna fault — it is a power-management response to low cell voltage. Keeping the battery above 3.6V during active navigation prevents this behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTransit 7SL EU shuts off without a low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a battery replacement, the device's fuel gauge is uncalibrated against the new cell. The battery indicator may show two or three bars right up until the unit cuts off. This happens because the voltage-threshold lookup is still tuned to the discharge curve of the degraded original cell. Run two full charge-to-cutoff cycles and the indicator recalibrates — after that, the warning appears at the correct voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377573167194,"sku":"BWCS-BKP700SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377573199962,"sku":"BWCS-BKP700SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377573232730,"sku":"BWCS-BKP700SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKP700SL-1.webp?v=1778771652"},{"product_id":"garmin-edge-explore-2-replacement-battery-37v-750mah-li-ion","title":"Garmin EDGE Explore 2 Replacement Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGarmin EDGE Explore 2 \/ Dezl OTR700 — 3.7V Li-ion Replacement Battery (361-00056-12)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 750mAh Li-ion cell that replaces the original battery in the Garmin EDGE Explore 2 GPS cycling computer and the Dezl OTR700 GPS navigator. Both devices use the same OEM part number 361-00056-12. Dimensions are 48.00 × 34.00 × 4.50mm — verify these against your original cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEDGE Explore 2 and Dezl OTR700 compatibility:\u003c\/strong\u003e\n    Both devices draw from the same 3.7V single-cell architecture and use an identical connector footprint and protection circuit pinout — that is why one cell covers both models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the cell through charge and discharge cycles on the EDGE Explore 2 platform. The BMS accepted a standard CC\/CV charge profile without fault flags, and the protection circuit tripped correctly at the low-voltage threshold before cell damage could occur.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start GPS initialisation after fitting:\u003c\/strong\u003e\n    After installing this cell, power the device on outdoors with clear sky view and let it run until satellite lock is confirmed. A full power interruption clears the GPS receiver's ephemeris data, so the first fix after a battery swap can take 5–10 minutes — subsequent fixes will be under a minute once the almanac is rebuilt.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EDGE Explore 2 shuts off without a low-battery warning\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe on-screen battery indicator on the EDGE Explore 2 is calibrated against the original cell's discharge curve. When a new cell is fitted, the device's fuel gauge hasn't yet mapped its capacity — the indicator reads inaccurately for the first few full charge and discharge cycles. The device can hit its internal voltage cutoff threshold at 3.0V per cell before the visual indicator reaches the empty mark, causing a sudden shutdown. Run two or three complete charge-to-discharge cycles to let the gauge recalibrate.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes missing from EDGE Explore 2 after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe EDGE Explore 2 stores routes and course data in flash memory, which is non-volatile and does not depend on battery power to retain data. However, if the device was not shut down cleanly before the battery was removed, any unsaved activity or in-progress route state held in RAM will be lost. Saved courses pre-loaded via Garmin Connect or BaseCamp are unaffected. To recover, reconnect to Garmin Connect and re-sync — your course library will repopulate from the cloud.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377573331034,"sku":"BWCS-GME200SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377573363802,"sku":"BWCS-GME200SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377573396570,"sku":"BWCS-GME200SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GME200SL-1.webp?v=1778771653"},{"product_id":"skygolf-skycaddie-sx550-replacement-battery-38v-5000mah-li-polymer","title":"SkyGolf SkyCaddie SX550 Compatible Battery 3.8V 5000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSkyGolf SkyCaddie SX550 — 3.8V Li-Polymer Replacement Battery (CXDHA 695776P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V 5000mAh Li-Polymer cell built to replace the original CXDHA 695776P battery in the SkyGolf SkyCaddie SX550 handheld GPS golf navigator. It powers the touchscreen display and GPS receiver through a full round of play. Capacity figures are taken directly from the product specification — 19Wh total energy.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSkyCaddie SX550 fit:\u003c\/strong\u003e\n    The SX550 uses a single flat Li-Polymer cell with a matching footprint of 75.20 × 57.10 × 7.00mm. The connector and cell geometry must match exactly — any dimensional mismatch puts pressure on the touchscreen assembly and can cause display damage.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the SX550's GPS-active load profile. The BMS held 3.8V nominal cleanly through sustained GPS acquisition and display-on states, with no unexpected cutoffs at the protection threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the SX550 fully on outdoors and let it acquire a satellite fix before heading to the first tee. GPS performs a cold start after any full power interruption — first fix takes 5–10 minutes. Subsequent warm starts drop well under a minute once ephemeris data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at the low-battery threshold on the SX550\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the SX550 battery drops below a certain voltage, the device can reduce GPS receiver sensitivity to protect remaining power for a clean shutdown. This shows up as yardage readings that update slowly or satellite count dropping on the status screen. It is not a GPS signal problem — it is the device pulling back receiver power. Keeping the cell above 3.6V during a round avoids this behaviour entirely.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSX550 shuts off mid-round without any low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh replacement cell needs a full charge cycle before the SX550's battery indicator reads accurately. Until the device has calibrated its voltage-to-percentage mapping, the indicator can show two or three bars and then cut off abruptly when the BMS hits its undervoltage protection floor. Charge the new cell to 100% before the first use, then discharge it fully on a round. After one complete cycle, the shut-off warning will trigger at the correct level.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377573691482,"sku":"BWCS-SGX550SL-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377573724250,"sku":"BWCS-SGX550SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377573757018,"sku":"BWCS-SGX550SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SGX550SL-1.webp?v=1778771669"},{"product_id":"calamp-ttu-1200-replacement-battery-37v-5200mah-li-ion","title":"CalAmp TTU-1200 GPS Replacement Battery 3.7V 5200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCalAmp TTU-1200 \/ TTU-2800 — 3.7V Li-ion Replacement Battery (1BF112-P11204730N)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 5200mAh Li-ion cell replaces the internal battery in the CalAmp TTU-1200 and TTU-2800 GPS tracking units. Both devices are fleet management and asset tracking hardware used in vehicle and equipment monitoring. Capacity is 5200mAh (19.24Wh) — matching the original spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTTU-1200 and TTU-2800 shared battery platform:\u003c\/strong\u003e\n    Both units run the same 3.7V single-cell architecture with an identical physical footprint and connector pinout. The BMS on each device uses the same voltage thresholds, so one cell covers both models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and full-load discharge on the TTU-1200 platform. The BMS accepted the cell without error flags, and charge termination occurred cleanly at 4.2V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start acquisition after power interruption:\u003c\/strong\u003e\n    After fitting this battery, power the unit on outdoors and allow it to acquire a satellite fix before deploying the vehicle. A full cold start after total power removal takes 5–10 minutes for first fix. Subsequent warm starts drop to under a minute once the almanac is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the TTU-1200 shuts off without warning at low battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TTU-1200 uses a voltage-threshold cutoff to protect the cell from deep discharge. After a new battery is fitted, the fuel gauge IC takes several charge-discharge cycles to recalibrate its state-of-charge curve. Until it recalibrates, the device can hit the hard cutoff voltage — typically around 3.0V — before the low-battery indicator has time to alert the user. Running two full charge-discharge cycles after installation lets the gauge settle and restores accurate shutdown warnings.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping during active tracking sessions\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eSome GPS tracking units reduce receiver sensitivity as battery voltage sags below a mid-range threshold — this lowers current draw but degrades positional accuracy. On the TTU platform, this shows up as increased position error or wider scatter in logged coordinates during long active tracking runs. The fix is straightforward: check that the vehicle's charging circuit is keeping the unit topped up during operation. If the unit is running purely on battery without an external charge source, expect reduced receiver performance once cell voltage drops below approximately 3.5V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377573822554,"sku":"BWCS-CPT120SL-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377573855322,"sku":"BWCS-CPT120SL-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377573888090,"sku":"BWCS-CPT120SL-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPT120SL-1.webp?v=1778771652"},{"product_id":"tomtom-pro-8270-replacement-battery-37v-2000mah-li-ion","title":"TomTom Pro 8270 GPS Replacement Battery UZ6 3.7V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTomTom Pro 8270 Series — 3.7V Li-ion Replacement Battery (UZ6)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2000mAh Li-ion cell replacing OEM part UZ6 in the TomTom Pro 8270, Pro 8275, Bridge, and 4F173 GPS navigators. It slots into the same footprint as the original at 65.50 × 50.80 × 5.30mm. Fit the cell when the original no longer holds a charge through a full navigation session.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePro 8270 \/ Pro 8275 \/ Bridge \/ 4F173 fit:\u003c\/strong\u003e\n    These four models share the same battery bay dimensions, connector pinout, and 3.7V voltage rail, so one cell covers the whole group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the cell through charge and discharge cycles on the Pro 8270 platform. The BMS accepted full charge without error flags and the device powered on cleanly at each stage of the cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the GPS fully on outdoors before driving. The unit performs a cold start after any full power interruption — first satellite fix typically takes 5–10 minutes. Subsequent warm starts drop to under a minute once almanac data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping at low battery on the Pro 8270\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen cell voltage falls below roughly 3.5V, some TomTom Pro units reduce receiver sensitivity to lower current draw. This shows up as position drift or a wider accuracy circle on the map — not a GPS signal issue. The fix is straightforward: a fresh cell running at nominal 3.7V restores the receiver to full sensitivity. If you see accuracy problems early in a session, check whether the old battery is voltage-sagging under the display and GPS receiver load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice shuts off without warning before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the on-device battery gauge is calibrated to an aged cell, not the replacement. The firmware's low-battery threshold is tied to a voltage curve that no longer matches a fresh 2000mAh cell. The device reads the voltage correctly but maps it to the wrong state-of-charge percentage, so the visual warning never fires before cutoff. Run two full charge-to-discharge cycles to let the firmware recalibrate its voltage-to-capacity mapping — the warning indicator should align by the third cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377574281306,"sku":"BWCS-TMP827SL-1","price":57.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377574314074,"sku":"BWCS-TMP827SL-2","price":67.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377574346842,"sku":"BWCS-TMP827SL-3","price":75.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TMP827SL-1.webp?v=1778771669"},{"product_id":"falk-fa-z10-replacement-battery-37v-1400mah-li-polymer","title":"Falk FA Z10 GPS Navigator Replacement Battery SR454362 3.7V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFalk FA Z10 \/ NEO 620 Series — 3.7V Li-Polymer Replacement Battery (SR454362)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1400mAh Li-Polymer cell replaces part number SR454362 in the Falk FA Z10 and NEO 620 series portable GPS navigators. It fits the FA Z10, NEO 620, NEO 620 LMU, and NEO 640. Voltage and capacity match OEM spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFA Z10 and NEO 620 platform fit:\u003c\/strong\u003e\n    These models share the same battery bay dimensions, connector pinout, and 3.7V supply rail. One cell covers the full group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the GPS platform. The protection circuit tripped correctly at the low-voltage cutoff threshold and accepted charge without error from a standard dock.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after fitting:\u003c\/strong\u003e\n    After a full power interruption, the FA Z10 performs a cold start and must rebuild its satellite almanac from scratch. Power the unit on outdoors and leave it stationary — first fix after a swap typically takes 5–10 minutes. Subsequent locks are faster once the almanac is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the FA Z10\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the SR454362 cell drops below roughly 3.5V under load, the FA Z10 reduces receiver sensitivity to conserve power. This shows up as wider position scatter or missed turn prompts — not a software fault. Charging the unit before a journey keeps the cell above the threshold where the receiver runs at full sensitivity. A fresh cell at 3.7V holds the receiver in full-power mode throughout normal use.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFA Z10 shuts off without warning before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe battery indicator in the FA Z10 reads state of charge from a voltage estimate calibrated to the original cell's discharge curve. A new cell — or a degraded one — can sit at a voltage the device reads as 30–40% remaining, then drop sharply under the GPS receiver and display load and hit the hardware cutoff. This looks like a sudden shutdown with no warning. The fix is to run two or three full charge cycles so the device re-calibrates its estimate against the actual cell. After conditioning, low-battery warnings should reappear at the correct charge level.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377574707290,"sku":"BWCS-FKZ100SL-1","price":16.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377574740058,"sku":"BWCS-FKZ100SL-2","price":18.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377574772826,"sku":"BWCS-FKZ100SL-3","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FKZ100SL-1.webp?v=1778771652"},{"product_id":"milink-7-av-player-navigation-replacement-battery-37v-1400mah-li-polymer","title":"Milink 7\" GPS Navigator Compatible Battery 3.7V 1400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMilink GPS-K146 7\" AV Player \u0026amp; Navigation — 3.7V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1400mAh lithium-polymer cell replaces the original battery in the Milink GPS-K146 and the wider 7\" AV player \u0026amp; navigation platform. It restores power to both the GPS receiver and the media playback functions when the factory cell can no longer hold a usable charge. Dimensions are 63.00 × 42.00 × 4.60mm — measure your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGPS-K146 platform fit:\u003c\/strong\u003e\n    The GPS-K146 shares its battery bay and connector pinout with the broader Milink 7\" AV navigation series. The cell voltage rail at 3.7V nominal matches the device's power management IC, so the BMS handshake completes without a calibration flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the navigation platform, confirming the BMS accepted the cell at first connection and that the charge controller reached cutoff at 4.2V without thermal event.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst satellite fix after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the unit fully on outdoors and let it acquire a satellite fix before use. GPS performs a cold start after any full power interruption — first fix can take 5–10 minutes. Subsequent warm starts drop under a minute once ephemeris data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS-K146 shutting off without warning during active navigation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the original battery ages, its actual capacity falls well below the rated 1400mAh, but the on-screen indicator stays miscalibrated against the old cell's discharge curve. The device reads the voltage and reports 20–30% remaining right up until the cell hits the low-voltage cutoff threshold. Fitting a new cell resets the discharge baseline, but the indicator will not recalibrate until the unit completes at least one full charge-discharge cycle. Run the device from 100% down to auto-shutoff once to let the power management IC re-anchor its voltage-to-percentage mapping.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes and POIs missing after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome navigation data on the GPS-K146 is held in battery-backed volatile RAM rather than written to flash on every update. A full power removal — which happens during a battery swap — wipes whatever was buffered but not yet committed to storage. Favourites and recent destinations stored in flash survive the swap; actively recorded routes or unsaved POIs do not. Before swapping the cell, export any critical routes to the device's SD card slot so they can be reloaded after power-on.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377574903898,"sku":"BWCS-FKZ100SL-1","price":16.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377574936666,"sku":"BWCS-FKZ100SL-2","price":18.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377574969434,"sku":"BWCS-FKZ100SL-3","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FKZ100SL-1.webp?v=1778771652"},{"product_id":"calamp-lmu-1100-replacement-battery-37v-900mah-li-polymer","title":"CalAmp LMU-1100 GPS Compatible Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCalAmp LMU-1100 \/ LMU-1200 Series — 3.7V Li-Polymer Replacement Battery (1BF112-453443CON)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 900mAh Li-Polymer cell replaces the original internal battery in CalAmp LMU-1100, LMU-1200, LMU-2600, and LMU-2700 GPS tracking units. These are compact fleet and asset trackers that run continuous GPS positioning alongside cellular data transmission — a combination that puts steady current demand on a small cell. At 50.00 x 30.00 x 5.80mm, this cell matches the original footprint for a direct fit inside the housing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLMU-1100 \/ 1200 \/ 2600 \/ 2700 platform fit:\u003c\/strong\u003e\n    These models share the same internal battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The BMS on each unit expects the same charge termination voltage, so one cell covers the full platform without any wiring changes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the LMU platform and confirmed the BMS accepted the cell without triggering a fault condition. Charge termination cut off cleanly at 4.2V and low-voltage protection activated before the cell reached unsafe depth of discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors before mounting it back in the vehicle. The LMU performs a full cold start after any complete power interruption — first satellite fix after a cold start typically takes 5–10 minutes outdoors with a clear sky view. Subsequent power cycles return to a warm start and lock much faster.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the LMU-1100 shuts off without warning at low battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe LMU-1100 uses a voltage-threshold shutdown rather than a fuel-gauge IC to determine remaining capacity. When the cell ages, its internal resistance rises, which causes voltage to sag sharply under load — even if the resting voltage looks acceptable. The device hits its low-voltage cutoff threshold while the displayed indicator still shows charge remaining. After replacing the cell, the voltage profile resets to match a healthy curve, and the shutdown threshold will once again correspond accurately to actual remaining capacity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping off during active tracking sessions\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome LMU units reduce GPS receiver sensitivity when battery voltage sags below roughly 3.5V under load — this is a firmware-level power conservation response, not a hardware fault. A degraded cell sags faster during the combined load of GPS acquisition and cellular transmission, which can pull voltage down even mid-session. The result is reduced satellite count and degraded position accuracy before the unit appears to be low on charge. Fitting a fresh 900mAh cell restores the voltage headroom the receiver needs to stay at full sensitivity throughout a tracking session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377575362650,"sku":"BWCS-CPL110SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377575395418,"sku":"BWCS-CPL110SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377575428186,"sku":"BWCS-CPL110SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPL110SL-1.webp?v=1778771652"},{"product_id":"appareo-stratus-2-replacement-battery-37v-5300mah-li-polymer","title":"Appareo Stratus 2 153010-000038 Replacement Battery 3.7V 5300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAppareo Stratus 2 \/ 2S \/ 3 — 3.7V Li-Polymer Replacement Battery (153010-000038)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 5300mAh Li-Polymer cell replaces the original battery in the Appareo Stratus 2, Stratus 2S, and Stratus 3 portable ADS-B receivers. These units deliver real-time weather, traffic, and terrain data to pilots via a connected tablet or EFB app. Fit the correct cell and the Stratus resumes normal ADS-B and GPS operation without configuration changes.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStratus 2, 2S, and 3 compatibility:\u003c\/strong\u003e\n    All three models share the same physical cell format, connector pinout, and BMS handshake protocol — the 3.7V voltage rail and 5300mAh capacity requirement are identical across the series, so one cell covers all three variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on a Stratus 2 unit. The BMS accepted the cell without fault flags, charge termination triggered correctly at 4.2V, and low-voltage cutoff engaged at the expected threshold without premature shutdown.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after power interruption:\u003c\/strong\u003e\n    After fitting this cell, power the Stratus fully on outdoors and let it acquire a satellite fix before your first flight. A full power removal clears the almanac cache, so the first fix after swap takes 5–10 minutes — subsequent warm starts return to under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eStratus shutting off without warning at low battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Stratus battery indicator reads remaining charge from a voltage curve stored in firmware. When a degraded or replaced cell has a slightly different discharge curve, the firmware can misread remaining capacity and cross the cutoff threshold before the visual warning triggers. This shows up as a sudden shutdown with the indicator still showing one bar. After fitting a new cell, run two full charge-to-discharge cycles to let the firmware re-calibrate its voltage-to-capacity mapping. If the unit still shuts off early, confirm resting voltage at full charge reads 4.18–4.20V before flight.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSaved routes and flight plan data missing after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Stratus 2 series stores flight-relevant data on its paired EFB app — not in onboard battery-backed RAM — so most route and airspace data survives a full power removal. However, device pairing credentials, custom alert thresholds, and calibration offsets are held in onboard non-volatile memory that can reset during a deep-discharge event before the swap. If settings are missing after fitting the new cell, reconnect to your EFB app via Bluetooth and step through the Stratus setup wizard to restore pairing and re-enter any custom alert values.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377575559258,"sku":"BWCS-APS200SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377575592026,"sku":"BWCS-APS200SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377575624794,"sku":"BWCS-APS200SL-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-APS200SL-1.webp?v=1778771652"},{"product_id":"tomtom-star-40-replacement-battery-37v-700mah-li-ion","title":"TomTom Star 40 GPS Replacement Battery VF3S 3.7V 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTomTom Star 40 \/ Star 40 Euro — 3.7V Li-ion Replacement Battery (VF3S)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 700mAh Li-ion cell that fits the TomTom Star 40 and Star 40 Euro portable GPS navigators. It replaces OEM part numbers VF3S and AHA11108003. Swap it in when the original cell no longer holds enough charge to complete a navigation session.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStar 40 and Star 40 Euro fit:\u003c\/strong\u003e\n    Both variants use the same 3.7V cell with identical connector pinout and physical footprint (36.70 × 36.50 × 5.80mm). The BMS on each unit accepts the same charge termination voltage, so one cell covers both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Star 40 platform and confirmed the BMS reached full charge termination without fault. Discharge cutoff triggered cleanly at the low-voltage threshold before the unit hard-reset.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-fix cold start after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors before driving. A full power interruption clears the GPS receiver's ephemeris data and forces a cold start — first satellite acquisition takes 5–10 minutes outdoors. Subsequent starts drop back under a minute once the almanac rebuilds.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the Star 40\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Star 40's GPS receiver draws the most current of any subsystem in the unit. When cell voltage drops toward the lower threshold, the device scales back receiver sensitivity to stretch remaining charge. You'll notice position jumps, sluggish rerouting, or the blue dot lagging behind your actual position. Plug in via USB or swap the cell before voltage drops below 3.5V to keep the receiver running at full sensitivity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eStar 40 shuts off without warning before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter fitting a new cell, the fuel gauge on the Star 40 may not reflect the actual charge state until it completes a full calibration cycle. The unit's shutdown threshold can trigger before the on-screen battery icon shows critical. Run one full charge from flat to 100% without interruption — this lets the BMS re-learn the cell's capacity curve and realign the visual indicator with the actual cutoff voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377575755866,"sku":"BWCS-TMG410SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377575788634,"sku":"BWCS-TMG410SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377575821402,"sku":"BWCS-TMG410SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TMG410SL-1.webp?v=1778771668"},{"product_id":"calamp-lmu-200-replacement-battery-37v-200mah-li-polymer","title":"CalAmp LMU-200 GPS Navigator Replacement Battery 3.7V 200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCalAmp LMU-200 Series — 3.7V Li-Polymer Replacement Battery (1BF112-E601435)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 200mAh lithium-polymer cell replaces the internal battery in the CalAmp LMU-200 GPS tracking unit. It also fits the LMU-300, LMU-800, and LMU-3000. The battery sustains GPS reception and cellular data transmission during vehicle tracking operations when the primary power source is interrupted.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLMU series compatibility:\u003c\/strong\u003e\n    The LMU-200, LMU-300, LMU-800, and LMU-3000 share the same compact Li-Polymer cell format, connector pinout, and 3.7V nominal voltage rail. The internal BMS handshake is consistent across these units, so one replacement cell covers the full range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the LMU platform. The BMS accepted the cell without fault codes, held voltage within spec through the full discharge curve, and cut off cleanly at the low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors and let it acquire a full satellite fix before deploying the vehicle. The LMU performs a cold start after any full power interruption — first fix takes 5–10 minutes. Subsequent warm starts are under a minute once GPS almanac data is rebuilt.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the LMU-200 stops transmitting position data after power loss\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe LMU-200 stores its last known configuration and network registration state in battery-backed memory. When the internal cell drains completely, that state is lost. On restart, the unit re-registers with the cellular network from scratch before it begins transmitting GPS positions again. Depending on network congestion, this re-registration can take several minutes — this is a software handshake delay, not a hardware fault.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLMU-200 shuts off without warning before the battery indicator trips\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a cell ages, its actual discharge curve no longer matches the voltage thresholds the firmware was calibrated against. The unit reads sufficient voltage until a sudden load spike — typically a cellular transmission burst — pulls the cell below 3.0V and triggers a hard cutoff. The visual low-battery warning never fires because the voltage drop is too fast. Replacing the cell restores the flat mid-range discharge curve the firmware expects, and the warning threshold behaves correctly again.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377575886938,"sku":"BWCS-CPL200SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377575919706,"sku":"BWCS-CPL200SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377575952474,"sku":"BWCS-CPL200SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPL200SL-1.webp?v=1778771652"},{"product_id":"tomtom-start-52-replacement-battery-37v-1000mah-li-ion","title":"TomTom Start 52 Replacement Battery 3.7V 1000mAh VF6F","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTomTom Start 52 \/ 4AL51 — 3.7V Li-ion Replacement Battery (VF6F)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1000mAh Li-ion cell replacing the original VF6F battery in the TomTom Start 52 and 4AL51 GPS navigators. It restores power to the unit when the original cell has degraded or stopped holding a charge. Voltage and capacity match the original spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStart 52 and 4AL51 compatibility:\u003c\/strong\u003e\n    Both units run the same 3.7V power rail, use the same connector footprint, and draw current through the same BMS handshake. One cell covers both models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Start 52 platform. The BMS accepted the cell cleanly, reported charge state correctly, and hit the full 3.7V nominal without triggering any protection cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after power interruption:\u003c\/strong\u003e\n    After fitting this cell, power the unit fully on outdoors before your first drive. The GPS performs a cold start after any complete power removal — first satellite fix can take 5–10 minutes. Subsequent warm starts drop back under a minute once the almanac is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the Start 52\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs the original cell ages and internal resistance climbs, voltage sags under the load of active navigation. Some GPS receivers, including the Start 52, reduce RF receiver sensitivity at low voltage to protect the system. The result is a weaker satellite lock and position drift you wouldn't see on a healthy cell. Fitting a fresh 1000mAh cell restores full receiver headroom and brings the unit back to its normal position accuracy.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eStart 52 shuts off without any low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe battery indicator on the Start 52 reads percentage against a calibrated discharge curve. When the original cell degrades, its actual capacity no longer matches what the firmware expects — the unit can show 30% remaining and cut out seconds later. This happens because the cell's voltage drops sharply once degradation sets in, crossing the hardware cutoff threshold before the display catches up. Fitting a fresh cell re-aligns the discharge curve and restores normal warning behaviour; charge the new cell to 100% and run a full discharge cycle to let the firmware recalibrate.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377576050778,"sku":"BWCS-TMS520SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377576083546,"sku":"BWCS-TMS520SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377576116314,"sku":"BWCS-TMS520SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TMS520SL-1.webp?v=1778771669"},{"product_id":"velocitek-shift-replacement-battery-37v-900mah-li-polymer","title":"Velocitek Shift GPS Replacement Battery VTK86 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVelocitek Shift — 3.7V Li-Polymer Replacement Battery (VTK86)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 900mAh Li-Polymer cell for the Velocitek Shift handheld GPS navigator. The Shift is a sailing performance device that delivers real-time wind and speed data on the water. This battery replaces part number VTK86 and fits the Shift directly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVelocitek Shift compatibility:\u003c\/strong\u003e\n    The Shift uses a single Li-Polymer cell with a 3.7V nominal rail and a specific connector footprint. The onboard BMS communicates directly with this cell to manage charge termination and low-voltage cutoff. Any cell going into this slot must match both the voltage and the physical dimensions — 49.50 × 30.00 × 6.00mm — to seat correctly without stressing the flex connector.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the bench and confirmed the BMS accepted the cell without fault flags. Charge termination triggered correctly at full capacity, and the low-voltage cutoff fired at the expected threshold before the cell could be damaged.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the Shift fully on outdoors and allow it to acquire a satellite fix before heading out. The unit performs a cold start after full power removal — first fix can take 5–10 minutes, versus under a minute on a subsequent warm start. Let it complete that fix on solid ground.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced when the Shift battery drops below half charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eSome GPS receivers scale back receiver sensitivity at lower battery voltages to reduce current draw. On a degraded or deeply discharged Li-Polymer cell, the voltage sag under load can push the Shift into this lower-power state even when the indicator still shows charge remaining. The result is slower position updates and reduced accuracy in heavy tree cover or at dock with obstructed sky view. Keeping the cell above 3.6V under load is the practical threshold where full receiver sensitivity stays active.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eShift shuts off without warning before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the battery gauge has drifted out of calibration — common after the original cell degrades significantly. The voltage-based shutoff threshold fires before the visual low-battery warning gets a chance to display. After fitting a new cell, run two full charge and discharge cycles to let the gauge recalibrate against the new cell's actual capacity curve. After those cycles, the warning indicator should reappear at the correct point, around 3.5V resting voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377576902746,"sku":"BWCS-VSK860SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377576935514,"sku":"BWCS-VSK860SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377576968282,"sku":"BWCS-VSK860SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-VSK860SL-1.webp?v=1778771669"},{"product_id":"tomtom-go-400-43-satnav-replacement-battery-37v-700mah-li-ion","title":"TomTom Go 400 3.7V Replacement Battery ICP523436 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTomTom Go 400 4FB40 — 3.7V Li-ion Replacement Battery (ICP523436)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 700mAh Li-ion cell that replaces the original ICP523436 battery in the TomTom Go 400 4.3\" Satnav and 4FB40. It fits directly into the GPS housing using the same connector and cell dimensions (36.50 × 36.50 × 5.70mm). When the original cell no longer holds enough charge to run active navigation, this is the direct replacement.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGo 400 and 4FB40 fitment:\u003c\/strong\u003e\n    Both models use the same ICP523436 cell format, voltage rail, and connector. The BMS handshake is identical across both, so no firmware conflict occurs on first boot after fitting.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge cycles on the Go 400 platform and confirmed the BMS accepted full charge without fault flags. Cutoff voltage held at the correct threshold throughout discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start preparation after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors and let it acquire a satellite fix before your first journey. The GPS performs a full cold start after any complete power interruption — first fix takes 5–10 minutes. Subsequent warm starts drop to under a minute once ephemeris data is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the Go 400\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs cell voltage drops toward 3.2V, some TomTom Go units reduce receiver sensitivity to conserve power. This shows up as position drift, late route recalculations, or the blue dot jumping between streets. The GPS chip is still running, but signal processing is throttled. A freshly charged cell returning 3.7V at rest resolves the behaviour immediately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGo 400 shuts off without warning before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAn aged cell loses capacity unevenly — voltage holds steady until it collapses suddenly under the load of the display and GPS receiver combined. The battery indicator reads one bar, then the unit cuts off before reaching the warning screen. This happens because the indicator is calibrated against a fresh cell's discharge curve, not a degraded one. After fitting a new cell, recalibrate the gauge by running a full charge-to-cutoff cycle before relying on the indicator.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377577394266,"sku":"BWCS-TMG430SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377577427034,"sku":"BWCS-TMG430SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377577459802,"sku":"BWCS-TMG430SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TMG430SL-1.webp?v=1778771669"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/collections\/BW-CS-IQN234SL-6.webp?v=1780882211","url":"https:\/\/batteryweb.com\/collections\/gps-navigator.oembed","provider":"BatteryWeb","version":"1.0","type":"link"}