{"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","url":"https:\/\/batteryweb.com\/products\/rand-mcnally-tnd-70-replacement-battery-37v-3500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}