{"product_id":"nokia-5110-replacement-battery-37v-900mah-li-ion","title":"Nokia BLS-2N Replacement Battery 3.7V 900mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 5110 \/ 6110 Series — 3.7V Li-ion Replacement Battery (BLS-2N)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 900mAh Li-ion replacement battery for the Nokia 5110, 6110, 6150, 7110, and over 19 additional Nokia handsets. It replaces OEM part numbers BLS-2N, BLS-4, BMS-2S, BPS-2, BLS-2, BLS-2S, and BLS-2V. If your original battery no longer holds a charge or the phone shuts down unexpectedly, this cell slots straight in.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model Nokia compatibility:\u003c\/strong\u003e\n    The 5110, 6110, 6150, and 7110 all share the same battery bay dimensions, connector pinout, and 3.7V supply rail. Nokia standardised this form factor across the late-1990s GSM handset range, so one cell services the full group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a Nokia 5110 and 6110. The BMS accepted charge immediately on both units, hit full termination voltage cleanly, and showed no protection-circuit trips during a full discharge run under normal GSM radio load.\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 down to auto-shutdown, then charge uninterrupted to 100% before normal use. The Nokia fuel gauge IC was calibrated to your original cell's degraded curve — one full cycle resets its reference points against 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\"\u003eWhy the Nokia 5110 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Nokia 5110 uses a simple coulomb-counting fuel gauge that builds its reference curve over time. When the original cell degrades, the gauge adjusts to that cell's compressed voltage window. A new 900mAh cell has a wider, healthier discharge curve — the old reference no longer maps to it accurately. The gauge may show 50% when the cell is nearly full, or jump erratically between readings. One full discharge-to-shutdown followed by an uninterrupted charge to 100% forces the IC to rebuild its reference against the new cell's actual behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shuts off suddenly at 20–30% on the new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity fault. Under GSM transmit load, the handset draws a sharp current spike — if the fuel gauge's low-battery threshold is still calibrated to the old cell, it triggers shutdown before the new cell is actually depleted. The fix is the same recalibration cycle: discharge fully to automatic shutdown, recharge to 100% without interruption. After one complete cycle, the cutoff threshold realigns to the new cell's 3.0V floor and the premature shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409483399258,"sku":"BWCS-NK2NSL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409483432026,"sku":"BWCS-NK2NSL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409483464794,"sku":"BWCS-NK2NSL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK2NSL-1.webp?v=1779579814","url":"https:\/\/batteryweb.com\/products\/nokia-5110-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}