{"product_id":"vivo-s5-replacement-battery-385v-3800mah-li-polymer","title":"Vivo S5 B-K2 Replacement Battery 3.85V 3800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo S5 \/ V1932A \/ V1932T — 3.85V Li-Polymer Replacement Battery (B-K2)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3800mAh (14.63Wh) lithium-polymer cell for the Vivo S5, S5 Dual SIM, V1932A, and V1932T smartphones. It replaces the OEM B-K2 pack when the original cell can no longer hold a usable charge across a full day. Dimensions are 73.10 × 62.60 × 5.04mm — verify your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS5 \/ V1932A \/ V1932T compatibility:\u003c\/strong\u003e\n    These model numbers share the same physical footprint, connector pinout, and BMS handshake protocol. The V1932A and V1932T are regional variants of the same board revision, so one cell fits all four.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the S5 platform. The BMS communicated correctly with the charge IC, accepted the full 3800mAh capacity, and did not trigger overcurrent cutoff during screen-on load.\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-to-charge cycle. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current charging pushes into an uncalibrated state.\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 S5 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a slightly different internal resistance curve than the worn cell the fuel gauge IC was calibrated against. Under peak load — active display, LTE modem, background sync — voltage can sag sharply even when the reported percentage looks safe. The phone's protection circuit reads this voltage drop as a low-cell event and shuts down before the displayed percentage reaches zero. One full discharge-charge cycle lets the coulomb counter remap its cutoff thresholds to the new cell's actual voltage curve, and the premature shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charging not working on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eVivo's proprietary charge protocol negotiates between the charger and the phone's charge IC on every session. With a freshly installed cell that the BMS has not yet initialised, some units refuse the high-current handshake and fall back to standard 5V charging. This is not a fault with the charger or the cell. Charge the phone once at standard rate until the battery reaches 100%, then reconnect — fast charging resumes normally once the BMS has completed its first full session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391912116314,"sku":"BWCS-BYS500SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391912149082,"sku":"BWCS-BYS500SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391912181850,"sku":"BWCS-BYS500SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BYS500SL-1.webp?v=1779142595","url":"https:\/\/batteryweb.com\/products\/vivo-s5-replacement-battery-385v-3800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}