{"product_id":"bbk-vivo-nex-replacement-battery-385v-3900mah-li-polymer","title":"BBK VIVO NEX Replacement Battery B-E6 3.85V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBBK VIVO NEX \/ NEX S \/ NEX A — 3.85V Li-Polymer Replacement Battery (B-E6)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3900mAh (15.02Wh) Li-Polymer cell for the VIVO NEX, NEX S, NEX A, and NEX Global Dual SIM. It replaces part number B-E6 when the original cell has degraded or failed. The flat pouch form factor measures 78.05 × 63.30 × 4.60mm and fits the NEX chassis without modification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNEX S, NEX A, and Global Dual SIM compatibility:\u003c\/strong\u003e\n    All four models share the same B-E6 cell footprint, voltage rail, and connector pinout. The BMS handshake and charge IC communication line are identical across the NEX lineup, so one cell covers the entire series.\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 discharge and charge on the NEX platform. The BMS accepted the charge handshake without fault flags, and cell voltage held within the expected 3.85V nominal range across the discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fast charge behaviour:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated state.\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 NEX after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue. The new cell's discharge curve does not match the lookup table the fuel gauge IC built from the old, degraded cell. When the modem transmits or the AMOLED panel peaks in brightness, current draw spikes and the new cell's voltage briefly sags below the system cutoff threshold — even though the reported percentage looks safe. The phone interprets that sag as a hard low-voltage shutdown event. Running one full discharge to around 3.0V and a full charge cycle lets the coulomb counter reset its reference points against the actual cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVIVO NEX reporting wrong battery percentage after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the NEX stores a charge curve learned from the old cell. After a swap, the IC is still referencing that stale curve, so percentage readings can jump erratically or read 100% when the cell is not fully charged. This is not a fault with the replacement cell — it is a calibration mismatch. Discharge the phone until it shuts down automatically, then charge uninterrupted to 100% with fast charging off. After that single cycle the fuel gauge IC rebuilds its curve against the new B-E6 cell and percentage accuracy stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391946358874,"sku":"BWCS-BYN180SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391946391642,"sku":"BWCS-BYN180SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391946424410,"sku":"BWCS-BYN180SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BYN180SL-1.webp?v=1779142719","url":"https:\/\/batteryweb.com\/products\/bbk-vivo-nex-replacement-battery-385v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}