{"product_id":"nokia-800-tough-replacement-battery-38v-2100mah-li-polymer","title":"Nokia 800 Tough BPCNTBY001B Replacement Battery 3.8V 2100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 800 Tough \/ TA-1186 — 3.8V Li-Polymer Replacement Battery (BPCNTBY001B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2100mAh Li-Polymer replacement battery for the Nokia 800 Tough rugged smartphone (models TA-1186 and TA-1186\/DS). It replaces OEM part numbers BPCNTBY001B and BV-5D. The cell dimensions are 82.50 × 40.00 × 4.50mm — measure your original before ordering if you are unsure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e800 Tough \/ TA-1186 compatibility:\u003c\/strong\u003e\n    Both TA-1186 and TA-1186\/DS share the same battery bay, connector pinout, and BMS handshake protocol — one cell covers both variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell in a TA-1186 unit and confirmed full BMS handshake, charge termination at 4.35V, and stable discharge under screen-on and modem-active load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging and run one complete discharge down to auto-shutdown, then charge to 100% on standard current. This gives the coulomb counter a clean reference curve before high-current charging begins on the new cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Nokia 800 Tough\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-cliff failure, not a capacity problem. At 20–30% state-of-charge, the cell voltage drops sharply under combined modem and display load — the BMS cuts power before the OS can log a low-battery event. The fuel gauge IC is still running its calibration curve from the old cell, so the percentage shown is inaccurate. One full discharge-to-shutdown cycle followed by a full charge resets the coulomb counter and resolves this on most units.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge in storage. If the cell drops below approximately 2.5V, the BMS enters a lockout state and blocks normal charging to prevent thermal runaway on a critically depleted cell. The phone will show no charge indicator and will not respond to a standard charger. Connect to a 5V USB source and leave it for 20–30 minutes — the charge IC applies a trickle current that brings the cell above the BMS recovery threshold, after which normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391775604826,"sku":"BWCS-NKT118SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391775637594,"sku":"BWCS-NKT118SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391775670362,"sku":"BWCS-NKT118SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NKT118SL-1.webp?v=1779141871","url":"https:\/\/batteryweb.com\/products\/nokia-800-tough-replacement-battery-38v-2100mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}