Way Systems BASIC56 MTT 1510 Replacement Battery 3.7V 850mAh

Way Systems MTT 1510 Series — 3.7V Li-ion Replacement Battery (BASIC56)

This 3.7V 850mAh Li-ion battery replaces the OEM BASIC56 cell in Way Systems MTT 1510, MTT 1556, MTT 1581, and MTT 1531 mobile payment terminals. It restores power to terminals that no longer hold a charge or fail to start. Dimensions are 50.65 × 37.25 × 7.30mm — an exact physical match for the original slot.

• MTT 1510, 1531, 1556, 1581 compatibility: These terminals share the same battery bay dimensions, 3.7V nominal rail, and BASIC56 connector pinout. The BMS handshake protocol is identical across the series, so one cell works across all listed models without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the MTT 1510. The BMS accepted the cell cleanly, voltage held stable at 3.7V nominal under combined wireless, display, and card-read load, and protection circuits tripped correctly at the expected cutoff threshold.
• First-boot calibration step: After installation, complete one full transaction cycle before deploying in a live environment. The terminal maps battery capacity during normal operation and needs at least one complete power cycle to calibrate the charge indicator correctly.

Terminal not completing PCI boot sequence after battery swap

The MTT 1510 runs a PCI security check on every cold boot. A new cell sometimes causes the terminal to stall mid-sequence because the BMS handshake hasn't been accepted yet. This is not a fault with the battery — it's the terminal confirming the power source is stable before loading the secure payment kernel. Charge the battery to at least 3.9V, then power the terminal on and allow the full boot sequence to complete without interruption.

Device not powering on after sitting unused in a drawer

Li-ion cells self-discharge roughly 2–3% per month. A terminal stored for several months can drop the cell below the BMS recovery threshold — typically around 2.5V — causing the terminal to show no response at all. Connect the terminal to the charger and leave it for 30–45 minutes before attempting to power on. If the charge indicator lights, the BMS has recovered the cell and normal charging will resume from that point.