B-H6 BBK VIVO iQOO Pro Compatible Battery 3.85V 4400mAh

BBK VIVO iQOO Pro Series — 3.85V Li-Polymer Replacement Battery (B-H6)

This is a 3.85V, 4400mAh (16.94Wh) Li-Polymer battery carrying OEM part number B-H6. It fits the VIVO iQOO Pro, VIVO iQOO Pro 5G, V1916, and V1916A. Install it when the original cell no longer holds charge through a normal day of use.

• V1916 and V1916A coverage: Both the standard iQOO Pro and the 5G variant (V1916A) share the same physical cell format, connector, and BMS handshake protocol — one B-H6 cell covers the full range without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a V1916A unit. The BMS accepted the charge IC handshake cleanly, held cell voltage above 3.6V under sustained screen and modem load, and tripped the protection circuit at the expected low-voltage cutoff.
• First cycle fast-charge protocol: On the first full cycle after fitting this cell, disable VIVO's Super FlashCharge in Settings → Battery. Run one complete discharge and standard charge first. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter.

Why the iQOO Pro reports wrong battery percentage after a cell swap

The fuel gauge IC on the V1916 board stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches actual cell chemistry, so the percentage reading drifts — often showing full charge at 4.1V or cutting the display to zero before the BMS actually trips. The fix is one full uninterrupted discharge down to automatic shutdown followed by a complete charge to 100% with the screen off. After that cycle, the coulomb counter resets its reference points against the new cell and percentage reporting stabilises.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff failure, not a capacity failure. Under combined 5G modem, display, and CPU load, the cell momentarily drops below the BMS cutoff voltage — typically around 3.2V — even though the fuel gauge still shows charge remaining. The original cell masks this because its internal resistance is calibrated into the system; a fresh cell with slightly different impedance triggers the cutoff earlier until the gauge IC recalibrates. Run the first-cycle discharge protocol above and confirm the shutdown stops occurring above 15%. If it persists past two full cycles, check that the battery connector is fully seated — a partially engaged connector raises contact resistance and accelerates voltage sag under load.