{"product_id":"vivo-x27-pro-replacement-battery-385v-3900mah-li-polymer","title":"Vivo X27 Pro B-G3 Replacement Battery 3.85V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo X27 Pro — 3.85V Li-Polymer Replacement Battery (B-G3)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3900mAh (15.02Wh) Li-Polymer battery for the Vivo X27 Pro. It fits the X27 Pro, VIVO X27 Pro Dual SIM, V1836T, and V1836 variants. Part number B-G3 matches the original connector layout and BMS handshake used across this device family.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eV1836T and V1836 compatibility:\u003c\/strong\u003e\n    Both variants share the same 3.85V power rail, B-G3 connector pinout, and BMS communication protocol — one cell covers the full range 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 full charge and discharge on a V1836 unit. The BMS accepted the cell on first connection, charge current ramped correctly through CC\/CV stages, and no protection trips were logged at load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installing this cell, disable fast charging and run one complete discharge down to automatic shutdown, then charge to 100% on standard current. This gives the fuel gauge IC a clean reference curve before high-current charging begins.\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 X27 Pro after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe X27 Pro's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell with different internal impedance hits a voltage cliff under modem or display load that the IC wasn't expecting. The phone interprets the voltage drop as a critically low state and shuts down — even though the gauge shows charge remaining. One full discharge-to-shutdown cycle followed by a complete charge resets the coulomb counter and eliminates these premature cutoffs.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eVivo's proprietary fast charge protocol negotiates with the BMS before ramping current. On a freshly installed cell, the BMS may respond conservatively on the first handshake — the charger falls back to standard 5V\/1A as a safety measure. This is not a fault with the cell or charger. Complete one full standard-current charge cycle, and the BMS will accept the fast charge handshake on subsequent connections.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391987515482,"sku":"BWCS-BYX272SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391987548250,"sku":"BWCS-BYX272SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391987581018,"sku":"BWCS-BYX272SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BYX272SL-1.webp?v=1779142762","url":"https:\/\/batteryweb.com\/products\/vivo-x27-pro-replacement-battery-385v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}