{"product_id":"vivo-v2348-replacement-battery-387v-5350mah-li-polymer","title":"Vivo BA49 V2348 Replacement Battery 3.87V 5350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo V40 5G \/ V2348 — 3.87V Li-Polymer Replacement Battery (BA49)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.87V, 5350mAh (20.7Wh) Li-Polymer replacement battery carrying OEM part number BA49. It fits the Vivo V2348 and V40 5G smartphones. Replace it when the original cell no longer holds a full charge, swells, or causes unexpected shutdowns.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eV2348 and V40 5G compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and BMS communication protocol — that is why BA49 covers both. The fuel gauge IC handshake is identical across this hardware revision.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on a V40 5G unit. The BMS accepted the cell without error flags, and the charge IC handed off to trickle correctly at 4.38V terminal voltage.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\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 discharge curve before high-current charging pushes amperage into an uncalibrated coulomb counter.\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 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still running a calibration curve built from the old degraded cell. The new cell has a steeper voltage cliff under modem and display load than the counter expects. The phone interprets that voltage dip as a deeper discharge than the percentage shown and triggers a protective shutdown. Run one full discharge to auto-off followed by an uninterrupted charge to 100% to let the coulomb counter reset against the new cell's actual curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not working on the first cycle after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge cycle with a new cell, the BMS may reject the handshake for high-current charging protocols until it has confirmed cell impedance is within range. The charge IC defaults to a lower constant-current rate as a safety measure. This is not a fault — it clears after one standard charge cycle completes. Plug into a standard 5V\/2A charger for the first full cycle, then reconnect your fast charger on the second cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391773147226,"sku":"BWCS-BYV234SL-1","price":36.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43391773179994,"sku":"BWCS-BYV234SL-2","price":42.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43391773212762,"sku":"BWCS-BYV234SL-3","price":47.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BYV234SL-1.webp?v=1779141870","url":"https:\/\/batteryweb.com\/products\/vivo-v2348-replacement-battery-387v-5350mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}