{"product_id":"vivo-iqoo-5-5g-replacement-battery-387v-4200mah-li-polymer","title":"Vivo iQOO 5 5G B-N9 Replacement Battery 3.87V 4200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo iQOO 5 5G — 3.87V Li-Polymer Replacement Battery (B-N9)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.87V, 4200mAh (16.25Wh) Li-Polymer replacement battery for the Vivo iQOO 5 5G, V2024A, and V2024. It replaces OEM part number B-N9 directly. Swap it when the original cell has degraded, lost capacity, or failed outright.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eiQOO 5 5G, V2024A, V2024 fit:\u003c\/strong\u003e\n    All three models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The B-N9 cell measures 81.20 × 64.30 × 5.46mm — any deviation would prevent the rear cover from seating or cause connector misalignment.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full charge and discharge on a V2024 unit. The BMS accepted the cell, reported state-of-charge correctly after calibration, and did not trigger protection cutoff under sustained 5G modem and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\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 map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell. 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 the iQOO 5 5G\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity failure. When the 5G modem and AMOLED display pull current simultaneously, a degraded or uncalibrated cell drops below the BMS cutoff voltage before the percentage gauge reaches zero. The phone shuts down because the cell cannot sustain voltage under that combined load — even though the fuel gauge still shows charge remaining. One full discharge-charge cycle with fast charging off recalibrates the coulomb counter and shifts the reported percentage to match actual cell voltage.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not accepted on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a cell swap, the charge IC on the iQOO 5 5G may fall back to standard 5W charging on the first cycle. The BMS on a new cell starts with default impedance values, and the phone's charge negotiation reads those values as outside the expected fast-charge window. This is not a fault — it clears after the first full cycle. Complete one standard charge to 100%, allow the phone to cool, then reconnect your fast charger. The phone should resume full fast-charge negotiation from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391891308634,"sku":"BWCS-BKU500SL-1","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391891341402,"sku":"BWCS-BKU500SL-2","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391891374170,"sku":"BWCS-BKU500SL-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKU500SL-1.webp?v=1779142541","url":"https:\/\/batteryweb.com\/products\/vivo-iqoo-5-5g-replacement-battery-387v-4200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}