{"product_id":"xiaomi-mi-8-se-replacement-battery-385v-3100mah-li-polymer","title":"Xiaomi Mi 8 SE BM3D Replacement Battery 3.85V 3100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eXiaomi Mi 8 SE — 3.85V Li-Polymer Replacement Battery (BM3D)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3100mAh (11.94Wh) Li-Polymer cell built to replace the BM3D battery in the Xiaomi Mi 8 SE. It fits the Mi 8 SE, Mi 8 SE Standard Dual SIM, Mi 8 SE Standard Dual SIM TD-LTE, and M1805E2A variants. Physical dimensions are 68.80 × 62.55 × 3.90mm — matching the original cell footprint inside the chassis.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMi 8 SE variant coverage:\u003c\/strong\u003e\n    All listed variants — Standard, Dual SIM, TD-LTE, and M1805E2A — share the same BM3D cell format, connector pinout, and BMS handshake protocol. One cell fits all four 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 full charge and discharge cycles on Mi 8 SE hardware. The BMS accepted charging handshake correctly, cutoff triggered cleanly at the low-voltage threshold, and no thermal flags fired during charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable fast charging for the first complete discharge-charge cycle after installation. The Mi 8 SE's fuel gauge IC is calibrated to the old cell's discharge curve — one slow cycle lets it remap against the new cell before high-current charging begins.\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 BM3D replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the Mi 8 SE's fuel gauge IC still references the discharge curve from the degraded original cell. When the new cell hits a voltage point the IC wasn't expecting, MIUI interprets it as a critical low and forces shutdown — even though usable charge remains. The fix is one full uninterrupted discharge to automatic shutdown followed by a complete charge to 100% with fast charging off. After that cycle, the coulomb counter recalibrates and percentage readings stabilise. If shutdown still occurs early, check that the battery connector is fully seated — a partial connection raises internal resistance and causes premature voltage sag under modem load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not accepted on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge cycle, the Mi 8 SE's charge IC may refuse Qualcomm Quick Charge negotiation with a new BM3D cell because the BMS presents a higher impedance than the IC expects from a known-good cell. The phone defaults to standard 5V charging as a safety fallback. Run that first cycle on a standard 5W charger — once the BMS logs an initial full cycle, the charge IC re-negotiates fast charge protocol on subsequent sessions. If fast charge still doesn't activate after the second cycle, verify the USB-C port is free of debris and the cable supports high-current delivery.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392024739930,"sku":"BWCS-MUX800SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392024772698,"sku":"BWCS-MUX800SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392024805466,"sku":"BWCS-MUX800SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUX800SL-1.webp?v=1779142963","url":"https:\/\/batteryweb.com\/products\/xiaomi-mi-8-se-replacement-battery-385v-3100mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}