{"product_id":"nokia-8210-replacement-battery-37v-750mah-li-ion","title":"Nokia BLB-2 8210 Replacement Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 8210 \/ 8310 Series — 3.7V Li-ion Replacement Battery (BLB-2)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion replacement battery carrying OEM part number BLB-2. It fits the Nokia 8210, 8250, 8270, 8310, and over 15 additional Nokia models sharing the same battery bay and connector format. Capacity is 750mAh (2.78Wh), matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e8210 \/ 8310 platform compatibility:\u003c\/strong\u003e\n    These models share the same voltage rail, physical footprint, and BLB-2 connector pinout. The BMS handshake is consistent across the series, so the phone's charge IC accepts the replacement cell 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 8210 platform. The BMS held cutoff correctly at both ends of the charge curve, and the charge IC did not flag a fault during the first full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this battery, run one complete discharge-charge cycle before relying on the percentage readout. The phone's fuel gauge IC was calibrated to the old cell's discharge curve — it needs one full pass against the new cell to report accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Nokia 8210 reports the wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 8210 uses a basic coulomb-counting fuel gauge IC that builds its percentage model from the discharge curve of whichever cell is fitted. When you swap in a new BLB-2 cell, the IC is still referencing data from the old, degraded cell. Until it completes one full discharge-charge cycle with the replacement, the percentage display will read high or jump between values. This is not a fault with the new cell — it corrects itself after a single calibration cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet recalibrated its low-voltage threshold to the new cell's discharge curve. The phone calculates 20–30% remaining based on the old cell's steeper voltage drop, but the new cell hits the BMS low-cutoff point — typically around 3.0V — sooner than the display predicts. The phone shuts off to protect the cell. One full discharge down to automatic cutoff, followed by a full charge, lets the IC reset its endpoint model and eliminates the false cutoff.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409481695322,"sku":"BWCS-NKB2ML-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409481728090,"sku":"BWCS-NKB2ML-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409481760858,"sku":"BWCS-NKB2ML-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NKB2ML_1.webp?v=1778213576","url":"https:\/\/batteryweb.com\/products\/nokia-8210-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}