{"product_id":"pocophone-poco-f1-replacement-battery-385v-3900mah-li-polymer","title":"Pocophone BM4E Poco F1 Compatible Battery 3.85V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePocophone Poco F1 — 3.85V Li-Polymer Replacement Battery (BM4E)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3900mAh (15.02Wh) Li-Polymer cell built to replace the OEM BM4E battery in the Pocophone Poco F1 and Poco F1 Armoured Edition. It fits both the standard global dual SIM and TD-LTE variants, including devices registered under model number M1805E10A. Voltage is 3.85V nominal, matching the Poco F1's power management IC spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePoco F1 and Armoured Edition fit:\u003c\/strong\u003e\n    Both variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The BM4E form factor — 85.20 × 64.00 × 4.02mm — seats directly into either chassis 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 charge and discharge cycles on the Poco F1 board. The BMS negotiated correctly with the Snapdragon 845's power management IC, and protection cutoffs triggered at expected thresholds under load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter to the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.\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 Poco F1 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still using the discharge curve from the old, degraded cell. The new cell holds a steeper voltage drop near its lower capacity range, and the gauge misreads remaining charge. Under modem or display load, actual cell voltage drops below the BMS cutoff before the percentage counter reaches zero. Run one full discharge to below 5% and a complete charge to 100% with fast charging off — this forces the coulomb counter to re-anchor to the new cell's curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Poco F1 uses Qualcomm Quick Charge 3.0 negotiation between the charge IC and the battery BMS. On the first cycle with a new cell, the BMS may not complete its handshake in time for the charger to step up voltage, so the device defaults to standard 5V charging. This is not a fault in the battery or charger. Complete one full standard charge cycle first, then Quick Charge negotiation typically resumes normally on the next session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391997608026,"sku":"BWCS-MUF100SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391997640794,"sku":"BWCS-MUF100SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391997673562,"sku":"BWCS-MUF100SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUF100SL-1.webp?v=1779142855","url":"https:\/\/batteryweb.com\/products\/pocophone-poco-f1-replacement-battery-385v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}