{"product_id":"infocus-m2-replacement-battery-38v-1800mah-li-polymer","title":"Infocus M2 Replacement Battery UP140008 3.8V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eInfocus M2 — 3.8V Li-Polymer Replacement Battery (UP140008)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 1800mAh lithium-polymer cell that replaces the original UP140008 battery in the Infocus M2 smartphone. It restores power to a phone that no longer holds charge or shuts down unexpectedly. Voltage and chemistry match the M2's charge IC and BMS requirements exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInfocus M2 fitment:\u003c\/strong\u003e\n    The M2 uses a fixed connector layout and a BMS that monitors cell impedance on every charge cycle. This cell matches that connector pinout and sits within the impedance range the BMS expects — so the charge IC accepts it without fault codes or charge refusal.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge passes on the M2 platform. The BMS did not trip on charge acceptance, and the fuel gauge IC began tracking state-of-charge from the first completed cycle without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the coulomb counter a clean reference point against the new cell's discharge curve before normal use.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Infocus M2 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe M2's fuel gauge IC stores a discharge curve calibrated to the original cell's internal resistance and capacity profile. When a new cell goes in, that stored curve no longer matches what the hardware is measuring. The result is percentage readings that jump, stall, or plateau — usually visible between 40% and 80% where the old curve diverges most from the new cell. One full discharge-charge cycle with the screen on and no fast charging resets the coulomb counter to the actual cell behaviour.\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 modem or display triggers a current spike and the cell voltage drops sharply under load — past the BMS low-voltage cutoff — even though the reported percentage looks safe. On a new cell, this is almost always a fuel gauge calibration issue, not a faulty battery. The BMS cuts power at roughly 3.2V per cell regardless of what the OS percentage shows. Run one full discharge cycle to let the fuel gauge relearn the actual voltage-to-capacity curve, and the shutdowns will stop once the counter is tracking real cell state.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392105152602,"sku":"BWCS-IMF200SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392105185370,"sku":"BWCS-IMF200SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392105218138,"sku":"BWCS-IMF200SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IMF200SL-1.webp?v=1779143797","url":"https:\/\/batteryweb.com\/products\/infocus-m2-replacement-battery-38v-1800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}