Dejavoo Q3 Payment Terminal Replacement Battery WHB03-3000 3.8V

Dejavoo Q3 / WIZARPOS Q3 — 3.8V Li-Polymer Replacement Battery (WHB03-3000)

This 3.8V, 3000mAh lithium-polymer battery replaces the original WHB03-3000 cell in the Dejavoo Q3 and WIZARPOS Q3 mobile payment terminals. Both terminals run the same battery platform — same connector, same BMS handshake protocol, same form factor at 58.40 × 47.20 × 7.10mm. Swap in this cell and the terminal restores full power to its display, receipt printer, and wireless stack.

• Q3 and WIZARPOS Q3 platform compatibility: Both devices share an identical battery bay, connector pinout, and BMS communication line. The WHB03-3000 part number covers both variants — no adapter or wiring change needed.
• Bench tested on actual hardware: We cycled this cell through full boot sequences and receipt-print events on the Q3 platform. The BMS negotiated correctly on first power-on, with no overcurrent trips across repeated print-and-tap transaction sequences.
• First deployment tip: After installation, run one complete transaction cycle — including a receipt print — before putting the terminal into live service. The Q3 maps battery capacity during normal operation, and the charge indicator will read inaccurately until that first full charge-discharge cycle completes.

Terminal rebooting mid-transaction after battery swap

The Q3's receipt printer draws a sharp current spike the moment it fires — often 1.5A or more for under a second. On a new cell that has not yet completed a conditioning cycle, the BMS may read that spike as an overcurrent event and cut power to protect the cell. This trips the terminal mid-transaction, which looks like a random reboot but is actually a BMS protection event. Run two or three print cycles off-peak first, let the BMS log normal draw patterns, and the trips stop.

Terminal not completing PCI boot sequence on first power-on

The Q3 runs a PCI-compliant boot check that includes a battery state read before the OS fully loads. A new cell that has not yet been through a charge cycle can present a state-of-charge reading the terminal flags as ambiguous, stalling the boot sequence at the splash screen. Connect the terminal to its charger, let it reach a full charge, then power on — the BMS handshake completes correctly once the cell registers above 4.1V on the charge IC.