{"product_id":"vivo-iqoo-8-replacement-battery-774v-2150mah-li-polymer","title":"Vivo IQOO 8 B-R8 Replacement Battery 7.74V 2150mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo IQOO 8 Series — 7.74V Li-Polymer Replacement Battery (B-R8)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.74V, 2150mAh Li-Polymer cell replaces the original B-R8 battery in the Vivo IQOO 8, IQOO 8 5G, and V2136A. It restores full device function — processor, display, 5G modem, and all onboard systems. Dimensions are 83.30 x 63.50 x 5.60mm, matching the original footprint.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIQOO 8 and V2136A compatibility:\u003c\/strong\u003e\n    These three models share the same battery bay geometry, connector pinout, and BMS handshake protocol. The B-R8 part number covers all three — no adapter or modification needed.\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 the IQOO 8 platform. The BMS accepted the new cell without error flags, and the charge IC held within spec across both standard and fast-charge current profiles.\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 for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's actual discharge curve before high-current fast charging pushes current into an uncalibrated state. Skip this step and percentage readings will drift.\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 a replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe IQOO 8's fuel gauge IC stores a charge curve calibrated to the original cell. A new cell with a different internal resistance profile hits a voltage cliff at a different state of charge than the stored curve expects. Under high load — 5G modem activity or display at full brightness — the cell voltage drops faster than the IC predicts, and the phone cuts power before the reported percentage reaches zero. One full discharge-charge cycle with fast charging disabled resets the coulomb counter against the new cell's actual curve. After that cycle, shutdowns at 20–30% stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not triggering on first cycle after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe IQOO 8 charge IC checks BMS cell voltage before handing off to the fast-charge protocol. On a new cell fresh from storage, resting voltage is typically around 3.7–3.8V per cell — within spec, but the IC may treat the uncalibrated cell as an edge case and fall back to standard 5V charging. This is not a fault with the battery or charger. Letting the phone complete one full standard charge cycle re-establishes the handshake, and fast charging resumes on the next plug-in. Confirm fast charge is active by checking the lock screen indicator — it should read \"Flash Charging\" at 5V\/4A or higher.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391833735258,"sku":"BWCS-BKV213SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391833768026,"sku":"BWCS-BKV213SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391833800794,"sku":"BWCS-BKV213SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKV213SL-1.webp?v=1779142264","url":"https:\/\/batteryweb.com\/products\/vivo-iqoo-8-replacement-battery-774v-2150mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}