KIOSK AQSI5 7.4V Replacement Battery 2600mAh Li-ion

KIOSK AQSI5 — 7.4V Li-ion 2600mAh Replacement Battery

This is a 7.4V 2600mAh Li-ion replacement battery for the KIOSK AQSI5 payment terminal. It fits the AQSI5 directly and restores power to terminals where the original cell has degraded or failed. Capacity figures are taken from the product specification — 19.24Wh total energy.

• AQSI5 platform fit: The AQSI5 uses a 7.4V two-cell Li-ion configuration with a BMS that negotiates capacity data at boot. This replacement matches that voltage rail and connector so the terminal's charge IC recognises the pack without triggering a hardware fault on power-up.
• Bench tested on actual hardware: We cycled this pack through simulated transaction loads — display on, wireless active, receipt printer firing — and monitored BMS overcurrent response. The protection circuit held through combined draw without tripping into lockout.
• First deployment tip: After fitting, complete one full transaction cycle before putting the terminal into a live queue. The AQSI5 maps battery capacity during normal operation and needs at least one complete power cycle to calibrate the charge indicator correctly.

Payment terminal rebooting mid-transaction after battery swap

The AQSI5 pulls a current spike the moment the receipt printer fires — that burst can hit the BMS overcurrent threshold on a cold or uncalibrated pack. If the BMS hasn't completed its first handshake with the charge IC, it reads the spike as a fault and cuts the cell to protect the circuit. This usually shows up in the first few transactions after a battery swap, not in general use. Run the terminal through two or three complete transaction cycles on a quiet bench connection before live deployment to let the BMS settle its overcurrent baseline.

AQSI5 not powering on after sitting unused in storage

Li-ion cells self-discharge at roughly 2–3% per month. A terminal left in a drawer for several months can drop the cell below the BMS recovery threshold — typically around 2.5V per cell — and the BMS locks out to prevent damage. The terminal will show no response at all: no boot screen, no charge indicator, nothing. Connect to a known-good charger and leave it for 30–45 minutes before attempting to power on; most BMS circuits enter a low-current trickle recovery mode that will bring the cell back above the 2.5V threshold needed to re-enable the output.