Vivo IQOO 12 Pro BA17 Compatible Battery 7.74V 2450mAh

Vivo iQOO 12 Pro — 7.74V Li-Polymer Replacement Battery (BA17)

This is a 7.74V, 2450mAh Li-Polymer cell built to replace the BA17 battery in the Vivo iQOO 12 Pro smartphone. It fits the iQOO 12 Pro directly and restores full power to the processor, display, modem, and internal systems. Capacity is rated at 18.96Wh — taken from product data, not estimated.

• iQOO 12 Pro fit: The iQOO 12 Pro uses a dual-cell Li-Polymer pack with a shared BMS connector pinout specific to this chassis. The BA17 part number maps to that exact connector layout and cell configuration — swapping in a mismatched cell trips the BMS handshake and prevents charging entirely.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the iQOO 12 Pro platform. The BMS accepted the new cell, charge current ramped correctly through CC/CV stages, and the fuel gauge IC registered the cell without throwing a fault flag.
• First-cycle fast-charge hold-off: After installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC needs one full cycle to map the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated cell — skipping this step causes erratic percentage readings early on.

Sudden shutdown at 20–30% on the iQOO 12 Pro after a cell swap

This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a voltage cliff under modem or display load that the IC does not anticipate, and the phone cuts power to protect the hardware. It is not a fault with the replacement cell itself. Run two full discharge-to-shutdown and charge-to-100% cycles without fast charging, and the coulomb counter will remap to the new cell's actual curve.

iQOO 12 Pro not powering on after the replacement battery sat in storage

Li-Polymer cells self-discharge in storage, and if the BA17 cell drops below approximately 2.5V per cell, the BMS enters a lockout state and refuses to accept a charge current. Plugging into a standard charger appears to do nothing — the phone stays off. Connect to a USB-C charger and leave it untouched for 20–30 minutes; the BMS trickle-charge circuit slowly brings the cell voltage back above the lockout threshold before allowing full charge current. If the cell voltage is recoverable, the phone will show a charge indicator after that window.