{"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","url":"https:\/\/batteryweb.com\/products\/rand-mcnally-tnd-740c-replacement-battery-37v-2000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}