{"product_id":"vivo-x50-pro-replacement-battery-387v-4250mah-li-polymer","title":"Vivo B-N7 X50 Pro+ Replacement Battery 3.87V 4250mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo X50 Pro+ — 3.87V Li-Polymer Replacement Battery (B-N7)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.87V, 4250mAh (16.45Wh) Li-Polymer battery for the Vivo X50 Pro+, X50 Pro Plus, and V2011A. It replaces the original B-N7 cell when capacity has dropped to the point where the phone no longer holds a charge through a normal day. Voltage and connector match the original spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eX50 Pro+, X50 Pro Plus, V2011A fit:\u003c\/strong\u003e\n    All three model designations share the same battery bay dimensions, connector pinout, and BMS communication protocol — the V2011A is the internal hardware revision code for the same physical device sold across different regions. One cell fits all three.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the B-N7 replacement through charge and discharge cycles on the V2011A board. The BMS accepted the cell, charge IC handshake completed without fault codes, and the fuel gauge IC tracked state-of-charge correctly after a full calibration cycle.\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 and run one complete discharge down to auto-shutoff, then charge to 100% on standard charging. This lets the coulomb counter in the fuel gauge IC map the new cell's discharge curve before high-current charging sessions begin.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Vivo X50 Pro+ shuts down suddenly at 20–30% after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the X50 Pro+ uses a stored discharge curve from the previous cell to predict remaining capacity. When a new cell goes in, that curve no longer matches actual cell chemistry, so the IC underestimates how close the cell voltage is to the BMS cutoff threshold. Under high load — 5G modem, screen at full brightness, camera active — the new cell's voltage drops sharply, hits the BMS floor faster than the percentage reading suggests, and the phone cuts power. One full discharge-to-shutoff cycle forces the coulomb counter to resync against the real cell curve and eliminates the premature cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD or proprietary fast charge not working on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eVivo's fast charge protocol requires the charge IC to negotiate current limits with the BMS on the new cell before stepping up to high-current delivery. On the first charge after installation, the IC defaults to a conservative 5V\/1A profile until it confirms BMS readiness — this is normal and not a fault with the replacement cell. If fast charge still fails after the first full cycle completes, check the charge port for debris and reseat the battery connector. A confirmed handshake shows the phone reporting the fast charge icon and the battery temperature climbing gradually rather than staying flat.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391863488602,"sku":"BWCS-BKX520SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391863521370,"sku":"BWCS-BKX520SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391863554138,"sku":"BWCS-BKX520SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKX520SL-1.webp?v=1779142367","url":"https:\/\/batteryweb.com\/products\/vivo-x50-pro-replacement-battery-387v-4250mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}