Ingenico AXIUM DX4000 Compatible Battery 7.4V 2600mAh

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

This 7.4V, 2600mAh Li-ion battery replaces the OEM pack in the Ingenico AXIUM DX4000 and DX8000 series portable payment terminals. It fits models DX4000, DX8000, DX8002, and DX8000-2-2Q95E. OEM part numbers covered: LD18650K-1, LD18650N, and LD18650M.

• DX4000 and DX8000 series compatibility: These terminals share the same battery bay geometry, connector pinout, and BMS handshake protocol across the AXIUM line. The same cell configuration — two 18650 cells in series — supplies the 7.4V rail that drives the display, wireless radio, and receipt printer simultaneously.
• Bench tested on actual hardware: We cycled this battery through full charge, contactless tap, chip-and-PIN, and thermal printer sequences. The BMS accepted the pack without fault codes, held voltage above 6.8V under combined printer and radio load, and discharged to cutoff without triggering overcurrent protection.
• First deployment tip for AXIUM terminals: After installation, complete one full transaction cycle before putting the terminal into live service. The AXIUM charge indicator maps capacity during normal operation and needs at least one complete power cycle to display charge state accurately.

Terminal rebooting mid-transaction after a battery swap

The AXIUM receipt printer pulls a short, sharp current spike — typically 1.5–2A above the idle draw — every time it fires. On a depleted or freshly installed battery, that spike can push the instantaneous current demand past the BMS overcurrent threshold, triggering a protection cutoff and forcing a reboot. This does not mean the battery is faulty. The BMS on a new cell is conservative until it has completed one or two full charge-discharge cycles and has mapped the cell's internal resistance. Run two complete charge cycles before concluding there is a hardware fault.

AXIUM DX4000 not powering on after sitting unused

Li-ion cells self-discharge at roughly 2–3% per month. A terminal stored in a drawer for several months can drop below 2.5V per cell — the threshold at which most BMS circuits lock the pack and refuse to output power. The AXIUM will show no response at all: no boot screen, no charging indicator. Connect the terminal to the OEM charger and leave it for at least 90 minutes without interruption. Most BMS circuits enter a recovery trickle-charge mode and will re-engage once the cell voltage climbs above 3.0V per cell.