About this replacement
Pax D230 — 3.7V Li-Polymer Replacement Battery (YW-018)
This is a 3.7V, 3400mAh Li-Polymer replacement battery for the Pax D230 portable payment terminal. It fits the D230 directly, using the same OEM part number YW-018. Swap it when the original cell no longer holds charge through a normal transaction shift.
- D230 platform fit: The D230 runs a single-cell 3.7V Li-Polymer architecture with a fixed connector and BMS handshake tied to the YW-018 spec. A cell outside that voltage window will fail the terminal's internal power negotiation and prevent boot.
- Bench tested on actual hardware: We cycled this cell through charge, idle, and active transaction simulation. The BMS accepted charge from the D230's internal charge IC without fault flags, and the cell held steady voltage under combined display, wireless, and printer draw.
- First-use cycle on the D230: After installation, run one complete transaction — including a receipt print — before deploying in a live environment. The D230 maps battery capacity during normal operation and needs at least one full power cycle to calibrate the charge indicator correctly.
Terminal rebooting mid-transaction after battery swap
The D230's receipt printer pulls a sharp current spike the moment it fires — easily the highest instantaneous draw the terminal generates. On a new cell that hasn't completed a calibration cycle, the BMS can read that spike as an overcurrent event and trip the protection circuit. This cuts power mid-transaction, which looks like a random reboot. Run a test receipt print with the terminal plugged in first; once the BMS has logged a full charge-discharge profile, the trip threshold stabilises and the reboots stop.
D230 not powering on after sitting unused in a drawer
Li-Polymer cells self-discharge slowly over weeks. If the D230 has been stored unpowered for several months, the cell voltage may have dropped below the BMS recovery threshold — typically under 2.5V — and the terminal will show no response on the power button. Connect the terminal to its charger for at least 30 minutes before attempting to power on; the charge IC needs to trickle-charge the cell back above the recovery floor before the BMS will allow a full boot. If the terminal still shows nothing after 45 minutes on charge, check that the charger output is confirmed at 5V before concluding the cell is unrecoverable.