VeriFone T650p Replacement Battery 7.4V 2600mAh Li-ion

VeriFone T650p — 7.4V Li-ion Replacement Battery (INR18650-2S1P)

This is a 7.4V, 2600mAh Li-ion replacement battery for the VeriFone T650p mobile payment terminal. It replaces OEM part number INR18650-2S1P and fits the T650p directly. Capacity is 2600mAh (19.24Wh), matching the original cell specification.

• T650p platform fit: The T650p uses a 7.4V two-cell series pack (2S1P configuration) with a BMS that handshakes with the terminal's charge controller on startup. This replacement uses the same cell arrangement and connector, so the terminal's charge IC recognises the pack without firmware errors.
• Bench tested on actual hardware: We cycled this pack through cold-start boot sequences and simulated transaction loads covering display, wireless radio, and thermal printer draws simultaneously. The BMS held stable across all three draw profiles without triggering overcurrent cutoff.
• First transaction cycle after install: Complete one full transaction — power on, process a card, print a receipt — before deploying in a live environment. The T650p maps battery capacity during normal operation, not during idle charging. That cycle lets the terminal set the charge indicator correctly so the gauge reflects actual state of charge.

Terminal not completing PCI boot sequence after battery swap

The T650p runs a PCI-compliant boot sequence that includes a battery authentication handshake. On a fresh pack, the BMS may not have completed its first charge acceptance cycle, which causes the terminal to stall or loop at the boot screen. This is not a faulty battery — it means the BMS and the terminal's charge IC have not yet exchanged a full charge-discharge profile. Charge the terminal to 100%, power it off, then power it back on. That sequence clears the handshake flag and the boot completes normally.

Terminal reboots mid-sale during receipt printing

The thermal printer in the T650p pulls a sharp current spike the moment it fires — on top of the active wireless radio and display draw already running. If the battery voltage sags below the BMS's low-voltage trip threshold during that combined load, the BMS cuts output to protect the cells and the terminal reboots. This usually appears on a degraded original pack, but can also occur on a replacement that has not yet been fully charged. Charge to 8.35V (full pack voltage) before the first live deployment to give the BMS enough headroom to absorb the printer spike without tripping.