{"product_id":"poco-m2-pro-replacement-battery-385v-4900mah-li-polymer","title":"Poco M2 Pro 3.85V 4900mAh Replacement Battery Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePoco M2 Pro — 3.85V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4900mAh Li-Polymer replacement battery for the Poco M2 Pro smartphone. It fits the original battery bay directly and restores primary power to the device. Capacity is rated at 18.87Wh, matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePoco M2 Pro fit:\u003c\/strong\u003e\n    The M2 Pro uses a specific battery bay measuring 93.65 × 64.10 × 4.50mm with a matching connector pinout. This cell matches those dimensions and the voltage rail the charge IC expects. A mismatched voltage or connector layout would prevent the BMS from communicating with the phone's power management unit.\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 M2 Pro platform. The BMS handshake completed correctly, fast charge was accepted after the first full cycle, and the fuel gauge IC tracked state-of-charge without erratic jumps.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge recalibration:\u003c\/strong\u003e\n    After installation, disable fast charging and complete one full discharge-charge cycle at standard rate. This gives the fuel gauge IC a clean discharge curve to calibrate against the new cell before high-current charging begins on an uncalibrated reference.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the M2 Pro reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe M2 Pro uses a coulomb counter in the fuel gauge IC that tracks charge based on the original cell's discharge curve. When a new cell goes in, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts — sometimes wildly. The fix is one complete discharge down to device shutdown, followed by a full charge to 100% at the standard rate. After that cycle, the IC has a fresh reference and percentage reporting stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops below the threshold the modem or display controller needs under load — even though the fuel gauge still shows charge remaining. The new cell's internal resistance behaves differently from the worn original, so voltage sags faster under peak draw. The fuel gauge IC hasn't recalibrated yet and misses the real cutoff point. Run one full discharge-charge cycle; if shutdowns persist, check that the resting cell voltage sits above 3.7V before starting the cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391936266330,"sku":"BWCS-MUR920SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391936299098,"sku":"BWCS-MUR920SL-2","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391936331866,"sku":"BWCS-MUR920SL-3","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUR920SL-1.webp?v=1779142677","url":"https:\/\/batteryweb.com\/products\/poco-m2-pro-replacement-battery-385v-4900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}