Fresenius Volumed VP5005 Replacement Battery 9.6V 3000mAh

Fresenius Volumed VP5005 — 9.6V Ni-MH Replacement Battery (120023)

This 9.6V, 3000mAh Ni-MH battery fits the Fresenius Volumed VP5005 volumetric infusion pump. It matches OEM part numbers 120023 and BATT/110023. The VP5005 is a clinical infusion device used to deliver precise medication volumes intravenously in hospital and ward environments.

• VP5005 platform fit: The Volumed VP5005 uses a 9.6V Ni-MH cell pack at this exact form factor — 89.54 × 43.13 × 44.90 mm — with a BMS that expects Ni-MH charge curves. Substituting Li-ion chemistry at this voltage rail will trigger a permanent charge fault on the pump's charge IC.
• Bench tested on actual hardware: We ran this cell through charge and load cycles on the VP5005 platform. The BMS accepted the handshake without fault, and the charge IC reached full capacity termination normally using the pump's onboard charger.
• Post-installation self-test cycle: After fitting this battery, let the VP5005 complete its full power-on self-test without interruption. The pump runs a BMS verification sequence at startup — cutting power mid-sequence registers a false battery fault that will persist until the next clean reboot.

Self-test failure after battery swap on the VP5005

The VP5005 runs a BMS learn cycle during its first few charge-discharge sequences on a new cell. Until that cycle completes, the pump's battery management logic does not have accurate capacity data for the new pack. This can cause the self-test to return a battery fault even when the cell is fully charged and electrically sound. Run one complete charge-discharge cycle before placing the unit in clinical use — the BMS recalibrates its capacity reference on that first full cycle.

Charge indicator not reaching 100% on first charge

On the first charge of a new Ni-MH pack, the VP5005's charge IC applies a conservative current limit while it establishes the cell's delta-V termination profile. The indicator may stall between 85–95% for an extended period before completing. This is not a fault — it reflects the charge IC building an accurate termination threshold for a new cell rather than relying on a stored value. Allow the pump to remain on charge until the indicator confirms full charge; it will complete normally and subsequent charges will terminate faster.