About this replacement
Ingenico IMP627 / IMP657 Series — 3.7V Li-Polymer Replacement Battery (296196699)
This 3.7V, 1800mAh Li-Polymer cell replaces the original battery in the Ingenico IMP627 and IMP657 portable payment terminals. It fits the IMP627-USBLU01A and IMP657-USJRS01A variants as well. Voltage and cell dimensions match OEM spec directly.
- IMP627 and IMP657 platform fit: Both terminal families run the same 3.7V power rail and use identical connector pinouts and BMS handshake logic. One cell covers both platforms without wiring or adapter changes.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an IMP627 unit. The BMS accepted the handshake on first boot, charge current stepped down correctly at the top-off threshold, and the terminal reported battery state without error flags.
- First transaction cycle after installation: After fitting this battery, complete one full transaction — card read, receipt print, and idle return — before live deployment. The terminal maps cell 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 IMP627 runs a PCI security check during every boot. If the BMS handshake has not been confirmed yet, the terminal can stall partway through this sequence and display a low-battery or boot error. This is not a fault with the cell — it means the charge IC has not yet completed its initialisation pass. Plug the terminal into its charging cradle immediately after fitting the battery, let it charge to full without interruption, then perform a clean boot. After that cycle the PCI sequence completes normally.
Terminal will not power on after sitting unused in a drawer
Li-Polymer cells self-discharge at roughly 2–3% per month. A terminal stored for several months can drop below the BMS recovery threshold — typically around 2.5V per cell — causing the protection circuit to open and block all output. The terminal appears completely dead even on a charger. Connect it to the original dock or a compatible 5V USB-C source and leave it for 20–30 minutes without attempting to power on; the BMS needs time to trickle charge back above the recovery threshold before it will allow normal current flow. Once the charge LED activates, charge to full before booting.