About this replacement
VeriFone Nurit 8040 / 8400 Series — 7.4V Li-ion Replacement Battery (84BTWW01D021008006114)
This 7.4V, 3400mAh Li-ion battery replaces the original pack in the VeriFone Nurit 8040 and Nurit 8400 payment terminals, including the PCI-compliant variant. It matches the OEM voltage rail and connector pinout so the terminal's charge IC recognises it immediately on first dock.
- Nurit 8040, 8400, and 8400 PCI compatibility: All three models share the same 7.4V battery bay, connector layout, and BMS handshake protocol. The PCI-compliant 8400 runs the same power subsystem as the standard 8400 — same battery, same charge curve, no firmware conflict.
- Bench tested on actual hardware: We cycled this cell through a full charge-discharge sequence on the Nurit 8400 platform. The BMS accepted the pack without fault codes, the charge IC entered constant-current phase normally, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- First deployment on the terminal floor: After installing the battery, run one complete transaction cycle — receipt print included — before going live. The terminal maps pack capacity during normal operation and needs at least one full power cycle to calibrate the charge indicator correctly. Skipping this leaves the status bar inaccurate for the first shift.
Receipt printer causing BMS overcurrent trip mid-transaction
The Nurit 8040's built-in thermal printer draws a sharp current spike the moment it fires — easily the highest instantaneous load the terminal places on the battery. On a degraded or freshly installed cell, the BMS can read that spike as an overcurrent event and cut output, which the terminal interprets as a power failure. This replacement pack is rated to handle that surge without tripping the protection circuit under normal print loads. If the terminal still cuts out mid-receipt, check that the battery contacts in the bay are clean and fully seated — a high-resistance connection amplifies the voltage drop during the print spike.
Terminal won't power on after sitting unused in a storage drawer
Li-ion cells self-discharge at roughly 2–3% per month. A Nurit 8040 left in a drawer for several months can drop below the BMS recovery threshold — typically around 2.5V per cell — at which point the protection circuit locks out and the terminal shows no response to the power button. Dock the terminal on a known-good charger and leave it connected for at least 30 minutes without pressing anything. Most BMS circuits re-initialise once the charger pushes the cell voltage back above approximately 3.0V per cell, after which normal charging resumes.