About this replacement
Terumo TE-112 — 7.2V Ni-MH Replacement Battery (6N-1200SCK)
This is a 7.2V, 2000mAh Ni-MH battery for the Terumo TE-112 infusion pump. It replaces OEM part 6N-1200SCK and fits the standard battery bay without modification. The TE-112 uses this pack to maintain fluid delivery during transport and temporary mains disconnection.
- TE-112 battery bay fit: The TE-112 requires a 7.2V Ni-MH pack at this exact cell configuration to satisfy the pump's BMS voltage window and charge termination logic. Substituting Li-ion or a different cell count will trigger a permanent charge fault on this platform.
- Bench tested on actual hardware: We cycled this pack through the TE-112's charge-discharge sequence and confirmed the BMS accepted the cell chemistry, completed delta-V cutoff correctly, and did not flag a battery fault on the pump's status display.
- Post-installation self-test protocol: After fitting this battery, let the TE-112 complete its full power-on self-test without interruption. The pump runs a BMS verification sequence at startup — cutting power mid-sequence logs a false battery fault that persists until the next clean reboot.
Why the TE-112 alarms low battery on a freshly charged replacement
The TE-112's BMS compares charge acceptance against a stored threshold calibrated for a broken-in OEM cell. A new Ni-MH cell has slightly higher internal resistance in its first few cycles, so the charge IC terminates early and the pump reads capacity as below threshold. This is not a fault with the battery or the pump. Run one full charge-discharge cycle outside clinical use and the BMS recalibrates — the alarm clears on the next charge.
TE-112 will not power on after replacement cell sat in storage
Ni-MH cells self-discharge at roughly 1–2% per day. A pack that has been warehoused for several months can drop below the TE-112's BMS recovery threshold — typically around 5.5V for a 7.2V pack — and the pump will not boot. Connect the pump to mains power first and leave it on charge for a minimum of four hours before attempting a battery-only start. If voltage has not recovered to at least 6.0V after that initial charge, the BMS may need a second full cycle before it releases the low-voltage lockout.