HTC Wizard Replacement Battery 3.7V 2350mAh WIZA16

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

This is a 3.7V 2350mAh Li-ion replacement battery for the HTC Wizard Windows Mobile smartphone. It slots into the original battery bay and powers the device's cellular radio, processor, and display. Capacity listed is from product data — 8.7Wh.

• HTC Wizard platform fit: The Wizard uses a single-cell Li-ion pack at 3.7V nominal with a fixed connector pinout. The WIZA16 part number maps directly to this platform — voltage rail and BMS handshake match the device's charge controller without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Wizard platform. The BMS accepted the charge IC handshake cleanly, balanced correctly at top-of-charge, and held the cutoff at the expected low-voltage threshold without tripping early.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge down to automatic shutdown, then charge uninterrupted to 100% before normal use. The Wizard's fuel gauge IC was calibrated to the original cell's discharge curve — one complete cycle resets that reference against the new cell.

Why the Wizard shuts down suddenly at 20–30% battery remaining

The HTC Wizard's charge controller reads voltage to estimate remaining capacity. An aged original cell develops high internal impedance, so under load from the GSM radio or backlight, terminal voltage drops sharply below the shutdown threshold — even though the fuel gauge still shows charge remaining. A new cell with lower impedance sustains voltage under the same load. After one full calibration cycle, the fuel gauge IC updates its reference and percentage readings stabilise against the new cell's actual discharge curve.

Battery percentage jumping erratically after fitting the replacement

This is the fuel gauge IC recalibrating. The Wizard stores a discharge model tied to the old cell's coulomb count and voltage slope — the new cell's characteristics don't match that stored model yet. Percentage can jump 10–15 points in either direction during the first one or two cycles. Run the device down to auto-shutdown and charge fully without interruption. By the second full cycle, the IC has enough data to track the new cell accurately and readings settle.