{"product_id":"nokia-n97-mini-replacement-battery-37v-1200mah-li-ion","title":"BL-4D Nokia N97 Mini Replacement Battery 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia N97 Mini \/ E5 \/ N8 \/ E7 — 3.7V Li-ion Replacement Battery (BL-4D)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion replacement cell for Nokia devices running the BL-4D battery. It fits the N97 Mini, E5, N8, E7, and several additional models that share the same form factor and connector. Dimensions are 60.00 × 43.80 × 4.50mm — swap in, close the back cover, done.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCross-model fit — N97 Mini, E5, N8, E7, and more:\u003c\/strong\u003e\n    Nokia standardised the BL-4D footprint across multiple handsets sharing the same PCB connector pitch and voltage rail. One cell covers the full compatibility list 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 full discharge and charge on BL-4D hardware. The BMS accepted charge handshake without fault flags, and voltage held stable under display-on and GSM transmission load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use, run the phone from 100% down to auto-shutdown, then charge uninterrupted to full. This gives the coulomb counter a complete reference curve against the new cell before the OS starts reporting state of charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the N97 Mini reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNokia's fuel gauge IC builds its capacity model by tracking coulombs in and out over time. When you swap the physical cell, the IC still holds the discharge curve of the old, degraded battery. The new cell has a different impedance profile, so the percentage readout drifts — often showing full well into discharge or dropping suddenly near 30%. One complete discharge-to-shutdown, followed by an uninterrupted full charge, resets the learned curve to the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on a freshly installed BL-4D cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff, not a capacity fault. Under modem transmission or peak display brightness, current draw spikes and cell voltage dips below the BMS cutoff threshold before the fuel gauge reaches zero. It happens most often in the first few cycles when the coulomb counter is still uncalibrated to the new cell. Run two full discharge-charge cycles and the shutdowns typically stop. If they persist past three cycles, check that the battery contacts on the phone chassis are clean and making firm contact — corroded pins add resistance and worsen voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405105725530,"sku":"BWCS-NK4DXL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405105758298,"sku":"BWCS-NK4DXL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405105791066,"sku":"BWCS-NK4DXL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK4DXL-1.webp?v=1779369970","url":"https:\/\/batteryweb.com\/products\/nokia-n97-mini-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}