{"product_id":"bbk-vivo-iqoo-3-replacement-battery-385v-4400mah-li-polymer","title":"BBK VIVO iQOO 3 B-K7 Replacement Battery 3.85V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBBK VIVO iQOO 3 Series — 3.85V Li-Polymer Replacement Battery (B-K7)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4400mAh (16.94Wh) Li-Polymer replacement battery for the VIVO iQOO 3, iQOO 3 5G, and V1955 smartphones. It uses OEM part number B-K7 and matches the original cell's dimensions at 78.60 × 63.00 × 5.60mm. It slots into the same position as the factory cell with no modification to the housing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eiQOO 3 and iQOO 3 5G compatibility:\u003c\/strong\u003e\n    Both variants share the same physical cell bay, voltage rail, and BMS connector pinout. The B-K7 part number covers the full iQOO 3 lineup because the charge IC and fuel gauge reference the same 3.85V nominal chemistry across all V1955 board revisions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on iQOO 3 hardware and confirmed the BMS accepted the cell without triggering an over-voltage or under-voltage cutoff. The charge IC stepped through trickle, constant-current, and constant-voltage phases without interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The fuel gauge IC on the iQOO 3 is calibrated to the old cell's discharge curve — letting it map the new cell at low current first prevents the coulomb counter from throwing inaccurate percentage readings from day one.\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 iQOO 3 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still running the discharge curve from the degraded original cell. When the new cell hits a voltage point the old curve maps to 20–30%, the system incorrectly reads imminent cutoff and shuts down — even though real capacity remains. The fix is one full uninterrupted discharge from 100% to automatic shutdown, followed by a full charge without interruption. After that cycle, the coulomb counter resets its reference and the percentage readings stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD or proprietary fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge after a cell swap, the iQOO 3's charge IC may stay in standard 5V charging mode and refuse to negotiate a higher voltage with the adapter. This is a BMS handshake behaviour — the charge controller holds back until it confirms the new cell's internal resistance profile falls within expected parameters. Run that first cycle on standard charge through a basic 5V USB source. On the second cycle, fast charging typically resumes without any further steps.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391947374682,"sku":"BWCS-BKQ300SL-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391947407450,"sku":"BWCS-BKQ300SL-2","price":37.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391947440218,"sku":"BWCS-BKQ300SL-3","price":41.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKQ300SL-1.webp?v=1779142719","url":"https:\/\/batteryweb.com\/products\/bbk-vivo-iqoo-3-replacement-battery-385v-4400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}