REA CARD Rea T6 Flex Compatible Battery 3.7V 2600mAh

REA CARD Rea T6 Flex — 3.7V Li-ion Replacement Battery

This 3.7V, 2600mAh Li-ion battery is a direct replacement for the REA CARD Rea T6 Flex portable payment terminal. It fits the Rea T6 Flex mobile POS unit used in retail and service environments. Swap it in when the original cell has degraded to the point where the terminal can no longer hold charge through a full shift.

• Rea T6 Flex compatibility: The T6 Flex uses a 3.7V single-cell Li-ion pack with a specific connector and BMS handshake tied to the terminal's charge IC. This cell meets that voltage rail and connector spec — the terminal's charge controller recognises it and enters normal charge mode without fault flags.
• Bench tested on actual hardware: We cycled this battery through the T6 Flex charge circuit and verified the BMS accepted the handshake, the charge IC moved correctly through CC and CV phases, and the protection circuit tripped at expected overcurrent thresholds during simulated printer motor draws.
• First deployment tip for payment terminals: After installation, complete one full transaction cycle before putting the terminal into live service. The T6 Flex maps battery capacity during normal operation and needs at least one complete power cycle to calibrate the on-screen charge indicator correctly.

Terminal rebooting mid-transaction after battery swap

The receipt printer motor inside the T6 Flex pulls a short, high-current spike every time it fires — typically enough to trigger the BMS overcurrent protection on a cell that hasn't yet completed its first full charge cycle. When the BMS trips, the terminal loses power instantly and reboots, which looks like a faulty battery but is actually a protection event. Charge the new cell to 100% before processing any transactions. After the first full charge, the BMS stabilises and the printer spike no longer crosses the overcurrent threshold under normal use.

Terminal not powering on after sitting unused in a drawer

Li-ion cells self-discharge at roughly 1–3% per month. If the T6 Flex has been stored for several months with the battery installed, the cell voltage can drop below the BMS recovery threshold — typically around 2.5V — and the terminal will show no response at all when you press the power button. Connect the terminal to its original charger and leave it for 15–30 minutes without pressing anything. The charge IC in the T6 Flex includes a trickle pre-charge mode that slowly brings the cell back above the 2.8V threshold needed for the BMS to re-initialise and allow normal boot.