{"product_id":"vivo-y93-replacement-battery-385v-3900mah-li-polymer","title":"Vivo Y93 B-F3 Replacement Battery 3.85V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo Y93 \/ Y93s Series — 3.85V Li-Polymer Replacement Battery (B-F3)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3900mAh (15.02Wh) Li-Polymer cell that replaces the original B-F3 battery in the Vivo Y93, Y93s, Y93st, and V1818CA. It restores full phone function — calls, apps, camera, and screen — when the original cell has degraded past usable capacity. Dimensions are 88.50 × 62.50 × 4.16mm, matching the original cell footprint exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eY93 series fit:\u003c\/strong\u003e\n    The Y93, Y93s, Y93st, and V1818CA all share the same B-F3 cell specification — same voltage rail, same physical envelope, and the same BMS connector pinout. One part number covers the full model range.\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 Y93 hardware. The BMS handshake completed correctly, the charge IC accepted the cell without fault codes, and the fuel gauge IC began tracking state-of-charge within the first full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fast charge tip:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging is applied to 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\"\u003eWhy the Y93 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Y93 uses a fuel gauge IC that tracks battery state based on a stored discharge curve built up from the old cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts — sometimes by 10–20%. The fix is one full calibration cycle: discharge the phone until it shuts off automatically, then charge uninterrupted to 100% without fast charging enabled. After that cycle, the fuel gauge IC recalibrates its coulomb counter against the new cell and percentage readings stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under high load — modem activity, screen at full brightness, or GPS — before the fuel gauge IC reads 0%. The original cell's internal resistance rises with age, so the phone's shutdown threshold was calibrated to a degraded voltage curve. A new cell has lower internal resistance but the fuel gauge IC hasn't learned its curve yet, causing a mismatch at the voltage cliff around 3.5–3.6V. Run the calibration cycle described above; after one full discharge-charge cycle the IC maps the new cell's floor correctly and premature shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392016842842,"sku":"BWCS-BKY930SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392016875610,"sku":"BWCS-BKY930SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392016908378,"sku":"BWCS-BKY930SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKY930SL-1.webp?v=1779142903","url":"https:\/\/batteryweb.com\/products\/vivo-y93-replacement-battery-385v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}