{"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","url":"https:\/\/batteryweb.com\/products\/garmin-dezl-otr800-replacement-battery-37v-2000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}