WalkMed Infusion Pump 7.2V 3600mAh Ni-MH Replacement Battery

WalkMed Infusion Pump / Infusion Triton — 7.2V Ni-MH Replacement Battery (300103)

This is a 7.2V, 3600mAh Ni-MH battery for the WalkMed Infusion Pump and Infusion Triton. It replaces OEM part numbers 300103 and OM11647. The WalkMed infusion pump delivers intravenous medication and fluids in controlled doses — in both clinical and home care settings.

• Infusion Pump and Infusion Triton fit: Both the Infusion Pump and Infusion Triton share the same 7.2V battery rail, connector footprint, and BMS handshake protocol — one cell format covers both platforms without modification.
• Bench tested on actual hardware: We ran this cell through charge and load cycling on WalkMed hardware. The BMS accepted the cell without a fault flag, and the charge IC completed its top-off stage at the expected 8.7V terminal voltage.
• Power-on self-test protocol: After fitting this battery, let the device complete its full power-on self-test without interruption. WalkMed infusion pumps run a BMS verification sequence at startup — cutting power mid-cycle writes a battery fault to memory that persists until the next complete reboot.

Why the WalkMed pump alarms low battery on a freshly charged replacement

The WalkMed BMS sets its pass threshold against calibration data from the original OEM cell. A new Ni-MH cell has not yet reached peak capacity — it typically needs one full charge-discharge cycle before the BMS recognises it as meeting threshold. On the first charge, the device may alarm low battery even after a confirmed full charge. Run one complete charge-discharge cycle before clinical use. The alarm clears once the BMS registers the cell's actual capacity against its learned baseline.

Device fails to power on after the replacement cell sat in storage

Ni-MH cells self-discharge at roughly 1–2% per day in storage. A cell stored several months can drop below 6.0V — the recovery floor for most WalkMed BMS firmware. Below that threshold, the BMS blocks power-on as a protection measure. Place the battery on charge for a full uninterrupted cycle before attempting to power the device. If the charger accepts the cell and the terminal voltage climbs above 7.0V, the BMS will reinitialise and the device will boot normally.