{"product_id":"nokia-lumia-925-replacement-battery-37v-2000mah-li-ion","title":"Nokia BL-4YW Lumia 925 Replacement Battery 3.7V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia Lumia 925 Series — 3.7V Li-ion Replacement Battery (BL-4YW)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2000mAh Li-ion cell replacing the OEM BL-4YW battery in the Nokia Lumia 925, Lumia 925T, Lumia 925.2, and Catwalk. All four models share the same battery bay dimensions and BMS handshake protocol. Capacity is rated at 7.4Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLumia 925 platform compatibility:\u003c\/strong\u003e\n    The 925, 925T, 925.2, and Catwalk variants all run the same voltage rail and use an identical connector pinout and BMS communication line. One cell fits the full group without modification.\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-discharge cycle on a Lumia 925 unit. The BMS accepted the handshake immediately, charge current ramped correctly, and the fuel gauge IC tracked state-of-charge without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, disable any fast-charge setting and run one complete discharge-to-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before it begins making percentage predictions under modem and display load.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Lumia 925 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff problem, not a capacity problem. When the modem or AMOLED panel pulls a high-current burst, a new cell with an uncalibrated fuel gauge can drop below the BMS cutoff threshold momentarily — even though the displayed percentage looks safe. The BMS interprets this as a low-voltage event and shuts the device down. One full discharge-to-charge cycle recalibrates the coulomb counter and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLumia 925 stuck in a boot loop or not powering on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells left unused for months can self-discharge below 2.5V per cell, which triggers BMS lockout — the protection circuit disconnects the cell to prevent damage, and the phone reads it as a dead or absent battery. Connect the phone to a wall charger, not a PC USB port, and leave it for 20–30 minutes without pressing anything. The charge IC needs to push a small trickle current to bring the cell above the BMS re-enable threshold, typically around 2.9V, before normal charging begins.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404293800026,"sku":"BWCS-NK925XL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404293832794,"sku":"BWCS-NK925XL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404293865562,"sku":"BWCS-NK925XL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK925XL-1.webp?v=1779369657","url":"https:\/\/batteryweb.com\/products\/nokia-lumia-925-replacement-battery-37v-2000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}