{"product_id":"vivo-s12-pro-replacement-battery-387v-4050mah-li-polymer","title":"Vivo S12 Pro B-T3 Compatible Battery 3.87V 4050mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo S12 Pro — 3.87V Li-Polymer Replacement Battery (B-T3)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.87V, 4050mAh (15.67Wh) Li-Polymer replacement battery for the Vivo S12 Pro, S12 Pro 5G, S12 Pro 5G 2022 Standard Edition, and V2163A. It replaces the original B-T3 cell when the existing battery shows capacity fade, unexpected shutdowns, or swelling. The dimensions are 83.75 x 61.45 x 4.50mm — confirm your device variant before installation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS12 Pro and V2163A compatibility:\u003c\/strong\u003e\n    These models share the same B-T3 cell format, connector pinout, and BMS handshake protocol. The fuel gauge IC on all variants reads the same cell ID — swapping in this cell triggers no lock-out or charge refusal on the main board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge cycles and monitored BMS communication, charge IC response, and cutoff voltage. The cell held 3.87V nominal across load cycles and the BMS reported state-of-charge correctly after a full recalibration pass.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst cycle after installation:\u003c\/strong\u003e\n    Disable fast charging for one complete discharge-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve. Running one slow cycle first lets the coulomb counter reset against the new cell before high-current charging starts.\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 S12 Pro after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC still holds the discharge curve of the degraded original cell. The new cell has a steeper voltage cliff at low charge states — the phone reads 25% but the cell voltage drops below the modem and display load threshold and the BMS trips. The OS sees a hard cutoff and logs it as a crash. One full discharge to automatic shutdown followed by an uninterrupted charge to 100% resets the coulomb counter and clears the mismatch.\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\"\u003eOn the first charge after installation, the charge IC may not receive a valid handshake from the new BMS and falls back to standard 5V charging. This is normal — the BMS on a fresh cell needs one complete cycle before it signals the charge IC to negotiate fast-charge protocols. Plug in with the stock charger, let the first charge complete without interruption, and fast charging will activate automatically on the second cycle. Do not use a third-party charger for this first cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391838945370,"sku":"BWCS-BKS120SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391838978138,"sku":"BWCS-BKS120SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391839010906,"sku":"BWCS-BKS120SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKS120SL-1.webp?v=1779142264","url":"https:\/\/batteryweb.com\/products\/vivo-s12-pro-replacement-battery-387v-4050mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}