{"product_id":"xiaomi-mi-play-replacement-battery-385v-3000mah-li-polymer","title":"Xiaomi Mi Play BM3H Replacement Battery 3.85V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eXiaomi Mi Play — 3.85V Li-Polymer Replacement Battery (BM3H)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BM3H is a 3000mAh, 3.85V Li-Polymer cell for the Xiaomi Mi Play (M1901F9E, M1901F9T). It replaces the original battery when capacity has degraded or the cell has failed. Capacity figure is 11.55Wh at nominal voltage.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eM1901F9E and M1901F9T compatibility:\u003c\/strong\u003e\n    Both regional variants of the Mi Play share the same battery bay dimensions (69.84 × 60.38 × 4.00mm), connector pinout, and BM3H part number. The BMS handshake and charge IC communication lines are identical across both SKUs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the BM3H through charge and discharge on Mi Play hardware and confirmed the BMS accepted charge termination correctly, with no false full-charge flags and no overcurrent trip during screen-on load testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fast charge protocol:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging pushes into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Mi Play reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Mi Play uses a coulomb-counting fuel gauge IC that builds its model against the previous cell's charge curve. When a new cell goes in, that stored model no longer matches the actual chemistry. The gauge reads an offset until it recalibrates. One full discharge to auto-off, followed by an uninterrupted charge to 100%, resets the count and re-anchors the percentage display to the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem or display draws a short current spike and the cell voltage drops below the BMS cutoff threshold before the gauge registers the drop. It is not a defective cell — it is a voltage cliff the fuel gauge did not predict because it was still running the old cell's discharge model. The fix is the same recalibration cycle: drain to shutdown, charge uninterrupted to 100%, and check that the percentage tracks smoothly below 30%. If the shutdown persists past two full cycles, verify the battery connector is fully seated and check for residual voltage at the connector — it should read above 3.6V on a charged cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391995674714,"sku":"BWCS-MUM190SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391995707482,"sku":"BWCS-MUM190SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391995740250,"sku":"BWCS-MUM190SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUM190SL-1.webp?v=1779142855","url":"https:\/\/batteryweb.com\/products\/xiaomi-mi-play-replacement-battery-385v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}