{"product_id":"xiaomi-mix-3-replacement-battery-385v-2650mah-li-polymer","title":"Xiaomi Mi Mix 3 BM3K Replacement Battery 3.85V 2650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eXiaomi Mi Mix 3 — 3.85V Li-Polymer Replacement Battery (BM3K)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2650mAh Li-Polymer replacement battery for the Xiaomi Mi Mix 3 smartphone. It fits models M1810E5E, M1810E5C, and the broader Mix 3 series that share the BM3K form factor and connector pinout. Install it when the original cell no longer holds a usable charge or the phone shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMix 3 series compatibility:\u003c\/strong\u003e\n    The M1810E5E and M1810E5C variants share an identical battery bay, connector, and BMS handshake. The same BM3K cell fits all of them — no adapter or pin modification needed.\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 Mix 3 platform. The BMS accepted the cell without fault flags, and the charge IC stepped through CC\/CV phases correctly.\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 full discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into 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 Mix 3 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Polymer cell has a slightly different voltage-to-capacity curve than the aged cell the fuel gauge IC was trained on. When the phone draws a surge current — modem transmit, screen brightness spike — the new cell's terminal voltage drops sharply under load. The system reads that drop as a hard low-battery cutoff and shuts down, even though the coulomb counter still shows 20–30% remaining. One full discharge-to-shutdown and uninterrupted charge cycle retrains the IC. After that cycle, the reported percentage tracks actual cell voltage accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD or fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eXiaomi's charge protocol negotiation runs between the charger, the charge IC, and the BMS. On the very first charge after a cell swap, the BMS may report an unverified cell state, causing the charge IC to fall back to standard 5V\/1A input as a precaution. This is not a fault with the battery or the charger. Complete one full slow charge to 100% and allow the phone to read the cell at rest. Fast charging resumes normally from the second cycle onward once the BMS clears the unverified-cell flag.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392017694810,"sku":"BWCS-MUX300SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392017727578,"sku":"BWCS-MUX300SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392017760346,"sku":"BWCS-MUX300SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUX300SL-1.webp?v=1779142963","url":"https:\/\/batteryweb.com\/products\/xiaomi-mix-3-replacement-battery-385v-2650mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}