{"product_id":"leagoo-m8-replacement-battery-38v-2000mah-li-ion","title":"Leagoo M8 Replacement Battery BT-572P 3.8V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLeagoo M8 \/ M5 Max — 3.8V Li-ion Replacement Battery (BT-572P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2000mAh Li-ion replacement battery for the Leagoo M8 and M5 Max smartphones. It carries OEM part number BT-572P and fits both models due to shared cell dimensions of 82.50 × 69.10 × 4.75mm and the same voltage rail. Capacity is rated at 7.6Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eM8 and M5 Max cross-compatibility:\u003c\/strong\u003e\n    Both phones use the same physical cell format, voltage rail, and BMS connector pinout. The BT-572P fits either model without modification. Verify the part number on your existing cell before ordering if you are unsure which model you have.\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 the M8 platform. The BMS handshake completed on the first cycle, the charge IC accepted current without interruption, and voltage held stable under simultaneous screen and modem load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, disable fast charging and run one complete discharge-to-charge cycle before normal use. This lets the fuel gauge IC map the new cell's discharge curve. Without this step, the coulomb counter remains calibrated to the old cell and will report inaccurate percentages.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the M8 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe M8 uses a fuel gauge IC that builds its percentage model from the discharge curve of whichever cell is installed. When you fit a new cell, the IC still holds calibration data from the degraded original. Until you complete a full discharge and charge cycle, the reported percentage can read 10–20% higher or lower than actual state of charge. One uninterrupted cycle from 100% down to automatic shutdown and back to 100% resets the coulomb counter against the new cell's actual curve.\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 modem's minimum voltage threshold under peak load, even though the fuel gauge still shows charge remaining. A fresh cell on an uncalibrated fuel gauge IC is the most common cause — the counter does not yet know where the real voltage cliff sits on this cell's curve. Run the recalibration cycle described above first. If shutdowns continue after one full cycle, check that the battery connector is fully seated, as a high-resistance contact causes the same voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392033652826,"sku":"BWCS-LGM800SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392033685594,"sku":"BWCS-LGM800SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392033718362,"sku":"BWCS-LGM800SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LGM800SL-1.webp?v=1779143030","url":"https:\/\/batteryweb.com\/products\/leagoo-m8-replacement-battery-38v-2000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}