{"product_id":"meizu-15-lite-replacement-battery-385v-3000mah-li-polymer","title":"MeiZu 15 Lite BA871 Compatible Battery 3.85V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMeiZu 15 Lite \/ M15 — 3.85V Li-Polymer Replacement Battery (BA871)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BA871 is a 3.85V, 3000mAh Li-Polymer cell for the MeiZu 15 Lite and M15 smartphones. It replaces the original battery when capacity has faded or the cell no longer holds a stable charge under load. At 11.55Wh, it matches the factory specification from the product data exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e15 Lite and M15 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The BA871 fits either variant without modification — the cell measures 73.92 × 62.05 × 3.70mm, matching the factory footprint.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the MeiZu 15 Lite platform. The BMS accepted the cell without triggering an over-voltage fault, and the fuel gauge IC began tracking state-of-charge correctly after one full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge recalibration:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging for the first complete discharge-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve. Running one full cycle at standard current lets the coulomb counter re-anchor to 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\"\u003eWhy the MeiZu 15 Lite reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MeiZu 15 Lite uses a fuel gauge IC that builds a discharge model from the previous cell's impedance and voltage curve. When a new cell goes in, that model no longer matches reality. The IC may report 40% while the actual cell voltage is already near 3.5V. One full discharge down to automatic cutoff, followed by a full charge to 4.35V, forces the IC to rewrite its reference curve against 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 current spike the cell cannot sustain at that state-of-charge. Voltage drops sharply below the BMS cutoff threshold — typically 3.0V — even though the gauge still shows charge remaining. It is a voltage cliff, not a capacity problem. The fix is the same recalibration cycle: drain to cutoff, charge fully to 4.35V, and the gauge will map the cliff correctly on subsequent cycles.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392022085722,"sku":"BWCS-MX871SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392022118490,"sku":"BWCS-MX871SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392022151258,"sku":"BWCS-MX871SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MX871SL-1.webp?v=1779142963","url":"https:\/\/batteryweb.com\/products\/meizu-15-lite-replacement-battery-385v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}