{"product_id":"nokia-6111-replacement-battery-37v-700mah-li-ion","title":"Nokia BL-4B Replacement Battery 3.7V 700mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 6111 \/ 7370 \/ 7373 Series — 3.7V Li-ion Replacement Battery (BL-4B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 700mAh Li-ion replacement battery for Nokia phones using the BL-4B or BL-4BA cell. It fits the 6111, 7370, 7360, 7373, and over a dozen additional models that share the same connector and form factor. Dimensions are 46.50 × 34.30 × 5.20mm — matching the original slot geometry.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model fit — 6111, 7370, 7360, 7373 and more:\u003c\/strong\u003e\n    All BL-4B and BL-4BA devices share the same voltage rail, physical footprint, and contact pinout. No adapter or modification needed — the connector seats the same way across the entire lineup.\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 6111 unit. The BMS accepted the charge handshake on the first connection, held voltage above 3.5V through a full discharge, and showed no false-cutoff events before depletion.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, let the phone discharge fully to auto-off, then charge uninterrupted to 100% before normal use. The fuel gauge IC on these Nokia models calibrates its coulomb counter against the first complete discharge curve — skipping this step causes the percentage to jump or read inaccurately for the first several days.\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 6111 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 6111 uses a simple fuel gauge IC that stores a discharge curve from the previous cell. When a new cell goes in, the IC is still reading against the old curve — so the percentage it shows does not match the actual state of charge in the new cell. This mismatch shrinks after one or two full discharge-charge cycles as the IC rewrites its reference data. Until that recalibration completes, readings between 20% and 80% are the least accurate. Run two full cycles after installation and the gauge stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the phone's modem or backlight pulls a brief current spike and the cell voltage dips below the BMS cutoff threshold — even though the gauge still shows charge remaining. A 700mAh cell at this voltage cliff cannot sustain the instantaneous load, so the BMS trips and the phone powers off. The fix is not a new battery — it is recalibration. Let the phone reach true zero (auto-off under load), then charge to 100% without interruption. After two full cycles the shutdown threshold and the gauge reading align, and the premature cutoff stops.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409475797082,"sku":"BWCS-NK4BML-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409475829850,"sku":"BWCS-NK4BML-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409475862618,"sku":"BWCS-NK4BML-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK4BML_1.webp?v=1779579814","url":"https:\/\/batteryweb.com\/products\/nokia-6111-replacement-battery-37v-700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}