Braun Perfusor Compact 3.6V Ni-MH Replacement Battery 3/N-600AAK

Braun Perfusor Compact — 3.6V Ni-MH Replacement Battery (3/N-600AAK)

This 3.6V, 1500mAh Ni-MH battery replaces the original cell in the Braun Perfusor compact infusion pump. It also fits the Syringe Pump Compact platform. Capacity figure is taken directly from product specification — 5.4Wh total energy.

• Perfusor compact and Syringe Pump Compact platform: Both devices share the same 3.6V battery rail, connector pinout, and BMS handshake protocol. A single cell format covers both because the charge management circuit accepts the same NiMH chemistry and thermistor signal from either unit.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Perfusor compact platform. The BMS accepted the cell, completed its verification sequence, and logged no fault codes during the test run.
• Post-install self-test protocol: After fitting this battery, let the device complete its full power-on self-test without interruption. The Perfusor compact runs a BMS verification routine at startup. Cutting power during that sequence triggers a false battery fault that stays latched until the next complete reboot.

Why the Perfusor compact flags a battery fault on a new cell

The Perfusor compact's charge IC applies a conservative acceptance threshold calibrated to a conditioned OEM cell. A fresh replacement hasn't completed a full charge-discharge cycle, so its internal resistance profile sits slightly outside the expected window. The BMS interprets this as a marginal cell and raises a fault flag. Running one complete charge-discharge cycle before clinical use brings the cell's resistance profile into the accepted range and clears the flag.

Charge indicator not reaching 100% on first charge

On first charge, the Perfusor compact's charge IC caps input to a new cell at a reduced rate until it confirms the cell's thermal response is stable. This is normal behaviour — not a fault in the battery or charger. The indicator will stop short of 100% and may hold there for an extended period. Complete a full cycle anyway, then recharge from empty. The second charge cycle should reach 100% with the cell now within the IC's verified acceptance window, confirmed at approximately 4.35V terminal across the cell at top of charge.