{"product_id":"bbk-vivo-s3-replacement-battery-37v-1200mah-li-ion","title":"BBK VIVO S3 Replacement Battery 3.7V 1200mAh BK-B-33A","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBBK VIVO S3 \/ V312 Series — 3.7V Li-ion Replacement Battery (BK-B-33A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion cell for the BBK VIVO S3, VIVO k302, VIVO k302+, and VIVO V312 smartphones. It replaces OEM parts BK-B-33A and BK-B-46. If your original battery no longer holds a charge or the phone shuts down unexpectedly, this cell restores normal operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVIVO S3 \/ V312 platform fit:\u003c\/strong\u003e\n    The S3, k302, k302+, and V312 share the same battery bay geometry, connector pinout, and BMS handshake protocol. One cell covers all four models without modification.\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 and discharge cycles on a VIVO V312 unit. The BMS accepted the cell without fault codes, charge termination triggered correctly at 4.2V, and the fuel gauge IC tracked state-of-charge without erratic jumps after one full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging and run one complete discharge-charge cycle at standard rate. The fuel gauge IC was calibrated to the old cell's discharge curve — one slow cycle lets it map the new cell before fast-charge current is applied to an uncalibrated coulomb counter.\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 S3 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 from the original cell. When the new cell's actual voltage drops below the old curve's predicted floor — typically around 3.6–3.5V under modem or screen load — the system interprets it as a critical low-battery event and shuts down, even though the reported percentage reads higher. It is not a fault with the replacement cell. One full slow-rate discharge-charge cycle forces the coulomb counter to rebuild the curve against the new cell, and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB charging not recognised on the first cycle after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA freshly installed cell at low state-of-charge can cause the charge IC to skip its USB-PD or proprietary handshake on the first plug-in. The charger may show connected but no current flows, or the phone screen stays dark. Plug into a standard 5V\/1A wall adapter — not a fast charger — for 10–15 minutes first. Once the cell reaches roughly 3.0V, the charge IC completes the handshake normally and charging proceeds.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404312313946,"sku":"BWCS-BKV312SL-1","price":27.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43404312346714,"sku":"BWCS-BKV312SL-2","price":31.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43404312379482,"sku":"BWCS-BKV312SL-3","price":33.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKV312SL-1.webp?v=1779369679","url":"https:\/\/batteryweb.com\/products\/bbk-vivo-s3-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}