{"product_id":"onext-care-phone-3-replacement-battery-37v-1200mah-li-ion","title":"ONEXT Care-Phone 3 Replacement Battery 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eONEXT Care-Phone 3 \/ Care-Phone 2 \/ Care-Phone 4 \/ Active Phone — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1200mAh Li-ion cell replaces the original battery in the ONEXT Care-Phone 3, Care-Phone 2, Care-Phone 4, and Active Phone. These are compact smartphones targeted at simplified, accessible daily use. The cell measures 53.00 × 33.90 × 5.70mm and delivers 4.44Wh of stored energy.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCare-Phone and Active Phone platform fit:\u003c\/strong\u003e\n    These four models share a common form factor and battery bay dimensions. The connector pinout and cell footprint are consistent across the range, so one cell covers all four handsets without modification.\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 full discharge on the Care-Phone 3. The BMS accepted charge current from the first cycle, held voltage above 3.5V through the discharge mid-point, and triggered protection cutoff cleanly at the low-voltage threshold with no spurious trips.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the Care-Phone 3:\u003c\/strong\u003e\n    After installing this cell, disable fast charging in settings for the first full discharge-charge cycle. This lets the phone's fuel gauge IC map the new cell's discharge curve before high-current charging begins. Skip this step and the percentage readout may drift by 10–15% until the IC self-corrects over several cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Care-Phone 3 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the Care-Phone 3 uses a coulomb counter calibrated against the original cell's charge and discharge curve. A new cell — even at the same rated capacity — has slightly different internal resistance and voltage behaviour. Until the IC runs at least one complete discharge from 100% to cutoff and back, the percentage display is extrapolating from stale data. After one full cycle without interruption, the gauge reanchors to the new cell and the readout stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–25% on the Care-Phone 3\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under load — typically during a call, screen-on GPS use, or background sync — and crosses the BMS protection threshold before the fuel gauge catches it. The gauge still reads 20–25% because it is tracking charge mathematically, but the real terminal voltage has already fallen below the cutoff point. It is more common on a new cell that has not yet been calibrated, or on a cell that has aged past its usable cycle count. Run one full discharge to automatic shutdown, then charge uninterrupted to 100%, and check whether shutdowns stop — if not, check that idle terminal voltage reads above 3.6V with a multimeter before installation.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404285935706,"sku":"BWCS-DEP215SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404285968474,"sku":"BWCS-DEP215SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404286001242,"sku":"BWCS-DEP215SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DEP215SL-1.webp?v=1779369550","url":"https:\/\/batteryweb.com\/products\/onext-care-phone-3-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}