About this replacement
Ingenico DB Cox3 — 3.7V Li-Polymer Replacement Battery (B25030001)
This 3.7V, 1800mAh Li-Polymer battery fits the Ingenico DB Cox3 portable payment terminal. It replaces OEM part numbers B25030001 and BTY00017. The DB Cox3 is a mobile POS device used by merchants in field and counter environments where battery condition directly affects transaction continuity.
- DB Cox3 platform fit: The DB Cox3 uses a fixed 3.7V Li-Polymer cell with a specific connector and BMS handshake tied to the terminal's power management controller. This replacement matches that voltage rail and connector, so the terminal's charge IC recognises the cell correctly on first boot.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the DB Cox3 platform. The BMS accepted the handshake without fault codes, and the charge IC moved from bulk to top-off mode at the correct threshold.
- First deployment cycle: After installing this battery, complete at least one full transaction cycle — including a receipt print — before deploying in a live environment. The terminal maps cell capacity during normal operation and needs one complete power cycle to calibrate the charge indicator correctly.
Terminal not completing PCI boot sequence after battery swap
The DB Cox3 runs a PCI security boot check on startup that draws a short burst of current. If the new cell hasn't completed a full charge cycle, the BMS may flag the draw as an anomaly and hold the boot process. This is a BMS initialisation issue, not a fault with the battery or terminal. Charge the battery to 100% with the terminal off, then power on and allow the full boot sequence to complete before use.
Terminal rebooting mid-transaction during receipt printing
The receipt printer in the DB Cox3 creates a brief high-current spike that older or degraded cells can't sustain without triggering BMS overcurrent protection — causing an unexpected reboot. A new cell at full charge handles this spike without tripping the cutoff. If reboots persist after fitting a fresh battery, check that the cell is fully charged before the first transaction; voltage below 3.6V under printer load is enough to trip the protection circuit.