{"product_id":"umx-mxw1-replacement-battery-37v-1150mah-li-ion","title":"UMX MXW1 Replacement Battery 3.7V 1150mAh Li-ion HYB201307","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUMX MXW1 — 3.7V Li-ion Replacement Battery (HYB201307)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1150mAh Li-ion battery for the UMX MXW1 smartphone. It replaces OEM part HYB201307 when the original cell degrades or fails. The battery slots into the MXW1 and restores normal device function including calls, messaging, and apps.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMXW1 fit and connector match:\u003c\/strong\u003e\n    The MXW1 runs a single-cell 3.7V Li-ion architecture with a low-current BMS handshake. This replacement cell matches that voltage rail and connector pinout exactly — the phone's charge IC sees it the same way it saw the factory cell.\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 MXW1 platform. The BMS accepted the cell without triggering protection cutoff, and the charge IC completed a full cycle without thermal fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter to the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MXW1 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MXW1's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry, so the percentage reading drifts. The IC reports numbers based on old data until it relearns. One full discharge down to auto-shutdown followed by a full charge to 100% forces the coulomb counter to reset against the new cell. After that cycle, percentage accuracy returns to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the MXW1 after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't finished recalibrating and the cell voltage drops sharply under modem or screen load — a voltage cliff the old curve didn't predict. The phone's low-voltage protection fires before the displayed percentage reaches zero. It's not a faulty cell. Run one full uninterrupted discharge-charge cycle and the IC recalibrates its cutoff threshold. If shutdowns persist past two full cycles, check that the battery connector is fully seated — a loose pin causes voltage sag under load and triggers the same protection at around 3.4V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391827738714,"sku":"BWCS-MXW100SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391827771482,"sku":"BWCS-MXW100SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391827804250,"sku":"BWCS-MXW100SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MXW100SL-1.webp?v=1779142264","url":"https:\/\/batteryweb.com\/products\/umx-mxw1-replacement-battery-37v-1150mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}