{"product_id":"bbk-vivo-y95-replacement-battery-385v-3900mah-li-polymer","title":"BBK VIVO Y95 Replacement Battery B-F9 3.85V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBBK VIVO Y95 — 3.85V Li-Polymer Replacement Battery (B-F9)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3900mAh Li-Polymer cell at 3.85V nominal, built to replace the original B-F9 battery in the VIVO Y95 smartphone. It matches the OEM connector, dimensions (79.10 × 64.06 × 4.60mm), and BMS handshake the Y95 charge IC expects. Capacity figure is 15.02Wh as rated from the product data.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVIVO Y95 fit:\u003c\/strong\u003e\n    The Y95 uses a dedicated battery bay sized for this exact cell footprint. The flex connector locks into the motherboard at the same pin-out as the original, so the charge controller recognises the BMS without a firmware flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge-discharge on the Y95 board and confirmed the BMS negotiated correctly with the charge IC — no over-voltage trip, no premature cutoff at the top-of-charge threshold.\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 and run one full discharge-to-charge cycle at standard current. This lets the Y95 fuel gauge IC map its coulomb counter 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\"\u003eSudden shutdown at 20–30% on the VIVO Y95 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the Y95's fuel gauge IC still holds the discharge curve of the old, degraded cell. When the new cell hits a voltage point the old curve mapped to 20–30%, the IC signals a low-voltage cutoff even though actual charge remains. The phone shuts down to protect against what it thinks is a voltage cliff. One full uninterrupted discharge down to automatic power-off, followed by a full charge, forces the coulomb counter to re-anchor to the new cell's actual capacity profile.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVIVO Y95 not powering on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge in storage, and if the B-F9 dropped below approximately 2.5V per cell, the BMS enters a lockout state and blocks current flow entirely. The phone will show no sign of life — no charging indicator, no boot. Connect to a wall charger at 5V standard output (not a fast charger) and leave it for 15–20 minutes without pressing the power button; this gives the BMS time to accept a trickle current and exit lockout before the main charge cycle starts. Once the charge LED activates, normal charging can resume.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391987712090,"sku":"BWCS-BKY950SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391987744858,"sku":"BWCS-BKY950SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391987777626,"sku":"BWCS-BKY950SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKY950SL-1.webp?v=1779142762","url":"https:\/\/batteryweb.com\/products\/bbk-vivo-y95-replacement-battery-385v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}