{"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","url":"https:\/\/batteryweb.com\/products\/rand-mcnally-tnd-1050-replacement-battery-37v-8000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}