{"product_id":"nokia-107-replacement-battery-37v-750mah-li-ion","title":"Nokia BL-4C Replacement Battery 3.7V 750mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 107 \/ 108 Series — 3.7V Li-ion Replacement Battery (BL-4C)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh Li-ion replacement cell for the Nokia BL-4C battery slot. It fits the Nokia 107, 108, 1265, 1325, and over 34 additional Nokia models that share the same BL-4C footprint. If your phone is shutting down unexpectedly, failing to hold charge, or not powering on at all, this cell replaces the degraded original.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBL-4C cross-model compatibility:\u003c\/strong\u003e\n    All listed models share the BL-4C form factor — same 53 × 34 × 4.80mm dimensions, same 3.7V nominal voltage rail, and the same spring-contact connector. No adapter or modification required.\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 a BL-4C compatible handset. The BMS engaged charge cutoff correctly at 4.2V and the low-voltage protection tripped as expected. No thermal event or anomalous voltage drop was recorded.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge-to-charge cycle before relying on the battery percentage indicator. The Nokia 107's fuel gauge IC holds calibration data from the old cell — one full cycle rewrites it against the new cell's discharge curve.\n    \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 107 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Nokia 107 uses a simple coulomb-counting fuel gauge that builds its percentage model from repeated discharge cycles on the original cell. When you install a new cell, that learned curve is still in memory — it no longer matches the new cell's actual voltage-to-capacity relationship. The result is percentage readings that jump or stall, typically showing full charge for an extended period then dropping suddenly. One complete discharge-to-charge cycle forces the gauge to resample the new cell and correct its model.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shuts off suddenly at 15–25% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge reports remaining capacity but the cell voltage drops below the BMS cutoff threshold under load — typically during a call when the RF transmitter draws a brief current spike. The old fuel gauge curve predicts voltage incorrectly, so the phone has no warning before the BMS trips. It is not a faulty cell. Run one full discharge cycle until the phone auto-shuts off from low voltage, then charge to 100% without interruption. After that cycle, the gauge recalibrates and the sudden shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409493885018,"sku":"BWCS-NK4CXL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409493917786,"sku":"BWCS-NK4CXL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409493950554,"sku":"BWCS-NK4CXL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK4CXL-1.webp?v=1778213576","url":"https:\/\/batteryweb.com\/products\/nokia-107-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}