Newland ME31 3.7V 2600mAh Replacement Battery for POS Terminal

Newland ME31 / SP630 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 2600mAh lithium-ion cell for the Newland ME31 and SP630 handheld payment terminals. It fits the compact POS form factor used by merchants for card transactions and mobile commerce. Voltage and capacity match the original cell specification.

• ME31 and SP630 platform fit: Both models share the same battery bay dimensions (66.00 × 21.80 × 18.50mm), the same 3.7V rail, and the same connector pinout. The BMS communication protocol is identical across this Newland terminal series, so the cell registers correctly without any firmware workaround.
• Bench tested on actual hardware: We cycled this cell through a full charge sequence and monitored the BMS handshake on boot. The charge IC accepted the cell without fault codes, and the protection circuit responded correctly to simulated overcurrent conditions during a printer-motor draw spike.
• First-use cycle before live deployment: After fitting this battery, run one complete transaction cycle — card read, receipt print, and shutdown — before putting the terminal into service. The ME31 maps charge capacity during normal operation and needs at least one full power cycle to display the battery indicator accurately.

Terminal rebooting mid-transaction after a battery swap

When the ME31 prints a receipt, the thermal printer motor draws a sharp current spike that can trip the BMS overcurrent cutoff on a new cell that hasn't completed an initial cycle. The BMS interprets the spike as a fault and cuts output voltage momentarily, which the terminal reads as a power loss. Running one full transaction cycle after installation lets the BMS characterise the cell's internal resistance and set the overcurrent threshold correctly. After that initial cycle, mid-transaction reboots from this cause stop.

Terminal not completing PCI boot sequence on a new battery

The ME31 runs a PCI security check during boot that draws more current than standby — if the cell voltage is below approximately 3.5V when you install it, the terminal may halt partway through the sequence or loop back to the splash screen. This is a voltage floor issue, not a compatibility fault. Connect the terminal to the charger for at least 20 minutes before the first boot attempt. Once the cell reaches a stable resting voltage above 3.6V, the PCI sequence completes normally.