{"product_id":"vivo-y50-replacement-battery-385v-4800mah-li-polymer","title":"Vivo Y50 Replacement Battery B-M3 3.85V 4800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo Y50 \/ 1935 — 3.85V Li-Polymer Replacement Battery (B-M3)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4800mAh (18.48Wh) Li-Polymer battery carrying OEM part number B-M3. It fits the Vivo Y50 and model variant 1935. It replaces a degraded or failed original cell to restore normal phone operation across calls, apps, and media.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eY50 and 1935 share this cell:\u003c\/strong\u003e\n    Both variants run the same PCB layout, connector pinout, and charge-management IC. The B-M3 cell matches the physical footprint (88.10 × 63.55 × 4.85mm) and voltage rail exactly — no adapter or wiring change needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the B-M3 through charge and discharge under modem and screen load. The BMS held cutoff correctly at low voltage and accepted charge current without thermal events or premature termination.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use after swapping this cell, disable fast charging and run one full discharge-to-charge cycle. The Y50's fuel gauge IC was calibrated to the old cell's discharge curve — one slow cycle resets that reference before high-current charging is applied to an uncalibrated cell.\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 Vivo Y50 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-cliff issue. A new cell has a steeper voltage drop curve under high-draw conditions — modem activity, screen brightness, or background sync — than the aged cell the fuel gauge was trained on. The gauge predicts 25% remaining but the actual cell voltage drops below the BMS cutoff threshold under load. The phone shuts down even though the displayed percentage looks safe. One full discharge cycle (down to auto-off, then charge uninterrupted to 100%) recalibrates the coulomb counter against the new cell and resolves this in most cases.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Y50's charge IC handshakes with the battery BMS before stepping up to higher charge rates. On the first cycle with a new cell, the BMS may reject the fast-charge handshake until it has one completed charge cycle logged. This is normal protective behaviour — not a fault. Plug in via a standard 5V charger for the first full charge, then switch back to the fast charger. The protocol should be accepted from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391946555482,"sku":"BWCS-BKY500SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391946588250,"sku":"BWCS-BKY500SL-2","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391946621018,"sku":"BWCS-BKY500SL-3","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKY500SL-1.webp?v=1779142719","url":"https:\/\/batteryweb.com\/products\/vivo-y50-replacement-battery-385v-4800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}