WizarPOS Q2 Replacement Battery 7.4V 2600mAh WHB02

WizarPOS Q2 — 7.4V Li-ion Replacement Battery (WHB02-2600)

This is a 7.4V, 2600mAh Li-ion battery for the WizarPOS Q2 portable payment terminal. It uses the original 5-pin connector and replaces part number WHB02-2600. Merchants use it when the original cell degrades and the terminal can no longer sustain a full business day of transactions.

• Q2 and Wizar Q2 compatibility: Both model names reference the same hardware platform. The 5-pin connector carries power lines and a BMS communication line — the terminal's firmware handshakes with the battery controller on boot. A mismatched connector or missing pin will stop the terminal from powering on entirely.
• Bench tested on actual hardware: We cycled this battery through repeated simulated transaction loads — display on, NFC active, printer firing — and monitored the BMS response. The overcurrent protection tripped correctly on fault conditions and reset cleanly without locking out the terminal.
• First-deployment cycle: After installing this battery, complete one full transaction cycle before putting the terminal into a live checkout environment. The Q2 maps battery capacity during normal operation and needs at least one complete power cycle to calibrate the charge indicator accurately.

Terminal not completing PCI boot sequence after battery swap

The WizarPOS Q2 runs a PCI-compliant boot sequence that includes a BMS handshake before the OS fully loads. On a new battery, the BMS may not yet have an accepted charge profile stored, which causes the boot sequence to stall or loop. This is not a fault with the battery — it resolves after the terminal completes one full charge-to-discharge cycle. Let the terminal boot on mains power first, complete a normal session, then run on battery alone until the charge indicator drops noticeably before recharging.

Charge indicator stuck at 99% after first charge

On a fresh cell, the Q2's charge IC enters a top-off phase that holds the display reading at 99% for an extended period. The cell is still charging — the IC is applying a low-current trickle to bring each cell to full voltage before declaring a 100% state. This is normal behaviour and not a sign of a faulty battery. Once the top-off phase completes, the indicator will step to 100% and the terminal will switch to standby draw.