{"product_id":"nokia-6250-replacement-battery-37v-1200mah-li-ion","title":"Nokia BLL-2 Replacement Battery 3.7V 1200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 6250 — 3.7V Li-ion Replacement Battery (BLL-2)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1200mAh Li-ion cell built to the BLL-2 specification for the Nokia 6250 mobile phone. It restores power to a phone whose original cell no longer holds a usable charge. Voltage and connector match the OEM BLL-2 exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNokia 6250 fit:\u003c\/strong\u003e\n    The 6250 uses a single-cell 3.7V Li-ion pack with the BLL-2 connector footprint. The charge IC on the mainboard talks directly to the pack over that connector — voltage tolerance and cell impedance both have to match for the charger to accept the battery and begin a full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge and discharge cycle on the 6250 mainboard. The charge IC accepted the pack on first insertion, stepped through CC\/CV phases without fault, and the BMS did not trip during the load cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, run one complete discharge to near-empty before recharging fully. The Nokia 6250 uses a simple fuel gauge IC that was calibrated against the original cell's discharge curve — one full cycle against the new cell resets that reference and stops the percentage reading drifting.\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 6250 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the 6250 mainboard tracks charge state using a stored discharge curve from the previous cell. A new cell with a slightly different internal impedance profile makes that stored curve inaccurate from day one. The IC interprets voltage readings against the old reference, so it shows incorrect percentages — sometimes jumping or reading high while the actual cell voltage is lower. One full discharge-to-charge cycle forces the IC to relearn the curve against the new cell and restores accurate reporting.\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 phone places a high-current demand — a call connection, a screen burst, or a background sync — and the cell voltage drops sharply under that load. The 6250's protection circuit reads the voltage dip as a dangerously low state and cuts power before the percentage display has caught up. It is a load-sag issue, not a faulty cell. To confirm the cell is healthy, check resting voltage after a full charge — it should read between 4.18V and 4.20V with no load applied.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409482776666,"sku":"BWCS-NKL2SL-1","price":21.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409482809434,"sku":"BWCS-NKL2SL-2","price":24.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409482842202,"sku":"BWCS-NKL2SL-3","price":26.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NKL2SL-big.webp?v=1779579815","url":"https:\/\/batteryweb.com\/products\/nokia-6250-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}