HTC Wizard WIZA16 Replacement Battery 3.7V 2800mAh

HTC Wizard — 3.7V Li-ion 2800mAh Replacement Battery (WIZA16)

This is a 3.7V Li-ion replacement battery rated at 2800mAh (10.36Wh) for the HTC Wizard. The Wizard is a Windows Mobile PDA phone from the mid-2000s, and original batteries at this age are typically well past their usable cycle count. This cell restores power to the device when the original has degraded beyond recovery.

• HTC Wizard platform fit: The Wizard uses a single-cell Li-ion pack at 3.7V nominal with a flat connector pinout matched to the WIZA16 part number. No adapter or modification needed — the voltage rail and connector layout are a direct match to the original bay.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Wizard platform. The BMS accepted a full charge without triggering overcurrent cutoff, and the device powered on cleanly from the first boot after installation.
• Fuel gauge recalibration on first cycle: On first use after installation, run one full discharge to system shutdown, then charge uninterrupted to 100% before normal use. The Wizard's fuel gauge IC was calibrated to the old cell's discharge curve — one complete cycle re-maps it to the new cell so percentage readings stay accurate.

Why the Wizard reports wrong battery percentage after a cell swap

The HTC Wizard uses a fuel gauge IC that tracks charge state by learning the discharge curve of the installed cell over time. When a new cell goes in, the IC is still running the old cell's curve — often one that reflects significant capacity fade from years of use. The mismatch causes the reported percentage to drift from actual charge state, sometimes by 15–25%. One complete discharge-charge cycle gives the IC enough data to re-anchor its coulomb counter to the new cell's actual behaviour.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC hasn't yet learned the new cell's voltage cliff — the point where terminal voltage drops sharply under load from the radio or backlight. The IC thinks 20% state-of-charge still has headroom, but the cell's actual voltage under load has already crossed the protection threshold and the BMS cuts power. After one full calibration cycle, the fuel gauge maps the cliff correctly and shutdown moves down toward 3–5% as expected. If the shutdown persists past two full cycles, check that the battery contacts in the Wizard's bay are clean and making solid contact — a resistive connection raises effective internal impedance and triggers early cutoff at the same voltage point.