About this replacement
B.Braun Perfusor Compact Plus — 7.4V Li-ion Replacement Battery (34522005)
This 7.4V, 2600mAh lithium-ion battery fits the B.Braun Perfusor Compact Plus infusion pump. The Perfusor Compact Plus is a clinical-grade syringe pump used for precise, programmable medication delivery. This battery restores portable operation when the original cell degrades below the pump's minimum voltage threshold.
- Perfusor Compact Plus compatibility: The pump's power management circuit references a specific voltage profile and connector pinout. Cross-reference OEM part numbers 34522005, 33170034, 120021-O, or 8717033 against your pump's battery label before installing.
- Bench tested on actual hardware: We cycled this cell through charge and discharge under the Perfusor's typical load profile. The BMS accepted the cell without triggering a chemistry-mismatch fault, and the protection circuit responded correctly to load step events.
- Post-swap power-on sequence: After installing this battery, let the pump complete its full power-on self-test without interruption. The BMS runs a verification cycle at startup — cutting power mid-sequence can register a false battery fault that persists until the next full reboot.
Why the Perfusor Compact Plus alarms low battery with a freshly charged replacement installed
The pump's charge-assessment algorithm is calibrated to the voltage-curve signature of an aged OEM cell. A new cell presents a slightly different open-circuit voltage profile, which the BMS can misread as a partially charged or non-conforming pack. This resolves after one complete charge-discharge cycle, which allows the pump's charge IC to recalibrate its capacity estimate against the new cell's actual curve. Do not place the pump in clinical use until this conditioning cycle is complete and the pump reports a full charge state without alarming.
Charge indicator not reaching 100% on first charge after battery replacement
On first charge, the Perfusor's charge controller applies a conservative current limit to an unrecognised cell, capping the reported state-of-charge below 100%. This is the charge IC protecting against overvoltage on an unknown pack — not a fault with the battery. Run one full charge cycle to completion, then discharge the pump under normal load, and charge again. After this second charge the controller should report 100% at a cell voltage of approximately 8.4V.