NEWPOS ET-5A Replacement Battery 7.4V 2100mAh Li-ion

NEWPOS NEW8110 — 7.4V Li-ion Replacement Battery (ET-5A)

This is a 7.4V 2100mAh Li-ion battery for the NEWPOS NEW8110 payment terminal. It replaces OEM part number ET-5A and restores power to the terminal after cell degradation or failure. Fits both NEW8110 and NEW 8110 variants — same connector, same BMS handshake.

• NEW8110 platform fit: The NEW8110 uses a fixed 7.4V two-cell Li-ion pack with a BMS that validates cell voltage on startup. This battery matches that voltage rail and connector pinout, so the terminal completes its boot sequence without throwing a battery fault code.
• Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on a NEW8110 unit. The BMS accepted the pack on first insertion, charge IC reached termination without error, and the terminal reported battery status correctly across the charge range.
• First deployment tip: After fitting this battery, run one full transaction cycle — print a receipt, process a card — before putting the terminal into live service. The NEW8110 maps battery capacity during normal operation and needs that first complete power cycle to calibrate the charge indicator accurately.

Why the NEW8110 reboots mid-transaction after a battery swap

The receipt printer motor draws a sharp current spike the moment it fires — often 1.5A or more for a fraction of a second. On a new cell that hasn't completed its first charge cycle, the BMS can read that spike as an overcurrent event and cut output to protect the pack. This trips a hard reboot rather than a graceful shutdown. Charge the battery fully before first use and complete one transaction cycle — once the BMS has logged normal draw patterns, nuisance trips stop.

Terminal stuck at the boot screen and not completing PCI startup

The NEW8110 runs a PCI-compliant boot sequence that checks battery voltage before loading the payment application. If the cell voltage sits below roughly 7.0V — common on a freshly installed battery that hasn't been charged yet — the terminal stalls at the boot screen or loops back to it. Connect the terminal to mains power first, allow the battery to charge for at least 20 minutes, then power on. The boot sequence will complete normally once cell voltage clears the minimum threshold.