{"product_id":"samsung-galaxy-m42-replacement-battery-385v-4700mah-li-polymer","title":"Samsung Galaxy M42 EB-BM425ABY Replacement Battery 3.85V 4700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy M42 — 3.85V Li-Polymer Replacement Battery (EB-BM425ABY)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4700mAh (18.1Wh) Li-Polymer battery for the Samsung Galaxy M42 smartphone. It replaces part number EB-BM425ABY when the original cell degrades, loses hold time, or fails to charge correctly. The battery restores full operational capacity to the M42's Snapdragon 750G platform, display, and modem stack.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGalaxy M42 cell fitment:\u003c\/strong\u003e\n    The M42 uses a dedicated battery bay sized for the EB-BM425ABY footprint — 82.70 × 65.22 × 5.10mm. The connector position and BMS handshake are matched to the M42's charge IC, so the device recognises the cell and enables Samsung's adaptive charging protocols without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the M42's charge controller and confirmed full BMS communication, correct voltage ramp from trickle to CC\/CV phase, and clean charge termination at 4.35V. No charge IC error codes triggered during our test cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter — preventing early percentage drift.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\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 because the fuel gauge IC on the M42 is still using the discharge curve of the old, degraded cell. When a fresh cell with a steeper voltage-drop profile hits a load spike — modem handoff, screen-on burst — the actual cell voltage collapses below the shutdown threshold faster than the gauge predicts. The phone cuts off even though reported percentage looks safe. One full discharge-charge cycle without fast charging allows the coulomb counter to recalibrate to the new cell curve. After that cycle, shutdowns at 20–30% stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not activating on the first cycle after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a cell swap, the M42's charge IC may default to standard 5V\/1A input for the first charge session. This is a BMS safety state — the controller holds back high-current charging until it completes one handshake cycle with the new cell's protection circuit. Plug in with the original Samsung charger and leave it until the phone reaches 100% without interruption. On the next charge session, fast charge resumes at the correct input rate and the charging icon updates accordingly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391884165210,"sku":"BWCS-SMM420SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391884197978,"sku":"BWCS-SMM420SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391884230746,"sku":"BWCS-SMM420SL-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMM420SL-1.webp?v=1779142560","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-m42-replacement-battery-385v-4700mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}