Ingenico AXIUM DX4000 Compatible Battery 7.4V 3350mAh

Ingenico AXIUM DX4000 / DX8000 Series — 7.4V Li-ion Replacement Battery (LD18650K-1)

This 7.4V, 3350mAh Li-ion battery replaces the original cell in the Ingenico AXIUM DX4000, DX8000, DX8002, and DX8000-2-2Q95E portable payment terminals. It matches the OEM part numbers LD18650K-1, LD18650N, and LD18650M. The cell fits the same physical bay and connects to the same BMS interface as the factory pack.

• AXIUM DX4000 and DX8000 platform compatibility: These models share the same 7.4V battery bay, connector pinout, and BMS communication protocol. One replacement cell covers the full range without any adapter or wiring change.
• Bench tested on actual hardware: We cycled this cell through the AXIUM boot sequence, NFC reader activation, receipt printer fire, and card swipe loads. The BMS handled each current spike without tripping into protection mode.
• First-transaction calibration: After installation, run one complete transaction — card read, receipt print, and display active — before putting the terminal into live service. The AXIUM maps battery capacity during normal operation and needs at least one full power cycle to display an accurate charge indicator.

Terminal rebooting mid-transaction after battery swap

The AXIUM DX4000 receipt printer pulls a sharp current spike the moment it fires — this is the highest single draw event the terminal creates. On a new cell whose BMS has not yet completed its first calibration cycle, that spike can briefly exceed the overcurrent threshold and trigger a protection cutoff, which the terminal reads as a power loss and restarts. The fix is not a hardware fault. Run three to five full transaction cycles, including receipt prints, on a charged battery before concluding the pack is faulty. After those cycles the BMS sets its overcurrent headroom to the actual load profile of the device.

Terminal not powering on after sitting unused in storage

Li-ion cells self-discharge over time. If a terminal sat unused in a drawer for several months, the cell voltage may have dropped below the BMS recovery threshold — typically around 2.5V per cell, or roughly 5.0V at the pack level. At that point the BMS locks out discharge and the terminal shows nothing when you press the power button. Connect the terminal to its dock or USB-C charger and leave it for 20 to 30 minutes without pressing any button. Most AXIUM BMS firmware includes a trickle-recovery mode that slowly raises the cell voltage back above the lock threshold before allowing a normal charge cycle to begin.