{"product_id":"bbk-vivo-x7-replacement-battery-385v-3000mah-li-polymer","title":"BBK VIVO X7 Replacement Battery B-A6 3.85V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBBK VIVO X7 Series — 3.85V Li-Polymer Replacement Battery (B-A6)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3000mAh Li-Polymer replacement battery for the VIVO X7, VIVO X7 Dual SIM, and VIVO X7 Dual SIM TD-LTE smartphones. It carries OEM part number B-A6 and matches the original cell's dimensions at 79.40 × 60.30 × 4.00 mm. Swap it in when the original cell can no longer hold a full charge or causes unexpected shutdowns.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVIVO X7 platform fit:\u003c\/strong\u003e\n    All three listed X7 variants share the same battery bay geometry, connector pinout, and BMS handshake protocol — that is why a single B-A6 cell covers the standard, Dual SIM, and TD-LTE models 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 the X7 platform. The BMS negotiated charge termination correctly, cell voltage held steady under screen and modem load, and no false full-charge flags were triggered.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, disable fast charging and complete one full discharge down to automatic power-off, then charge uninterrupted to 100%. This gives the fuel gauge IC one clean reference cycle against the new cell's discharge curve before high-current charging begins on an uncalibrated cell.\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 X7 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe X7's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The gauge reads against stale data, so the percentage on screen drifts — often showing more charge than the cell actually holds. One complete discharge-to-shutoff cycle followed by a full uninterrupted charge forces the coulomb counter to reset and build a fresh curve against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff failure — the cell's terminal voltage drops below the SoC threshold the modem or display requires before the fuel gauge reaches zero. It happens most often when the gauge IC is still calibrated to the old cell's curve and overestimates remaining capacity. Under combined screen brightness and LTE modem load, current draw spikes and voltage sags past the cutoff point before the displayed percentage catches up. Run one full recalibration cycle first; if the shutdowns persist after that, check that the battery connector is fully seated — a loose contact increases internal resistance and worsens voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392091750490,"sku":"BWCS-BKX700SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392091783258,"sku":"BWCS-BKX700SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392091816026,"sku":"BWCS-BKX700SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKX700SL-1.webp?v=1779143685","url":"https:\/\/batteryweb.com\/products\/bbk-vivo-x7-replacement-battery-385v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}