Medima Syringe Pump S2 Replacement Battery 9.6V 2000mAh

Medima Syringe Pump S2 / P2 — 9.6V Ni-MH Replacement Battery (120049)

This is a 9.6V 2000mAh Ni-MH replacement battery for the Medima Syringe Pump S2 and Syringe Pump P2 infusion devices. It replaces OEM part number 120049 and restores internal power to the pump's delivery and alarm systems. Capacity is 2000mAh (19.2Wh), matching the original cell specification.

• S2 and P2 platform compatibility: Both the Syringe Pump S2 and P2 share the same 9.6V battery bay, connector pinout, and BMS handshake protocol. One cell format serves both units without modification.
• Bench tested on actual hardware: We ran a full charge-discharge cycle on the bench. The BMS accepted the cell, completed its initialisation sequence, and the protection circuit held voltage within the expected window under a simulated load profile consistent with syringe pump operation.
• Post-installation self-test cycle: After fitting this battery, allow the pump to complete its full power-on self-test without interruption. The device runs a BMS verification step at startup — cutting power during this sequence triggers a false battery fault that persists until the next clean reboot cycle.

Why the Syringe Pump S2 flags a battery fault in the first 10 cycles

The S2 uses a charge IC that applies conservative thresholds when it encounters a new or unfamiliar cell. Ni-MH cells also have lower initial capacity on the first few cycles before the electrodes fully activate. The BMS compares measured capacity against a stored threshold, and a new cell can fall short until it's been cycled. Running one complete charge-discharge cycle before clinical use allows the BMS to update its learned capacity value and clear the fault flag.

Pump will not power on after the battery has been in storage

Ni-MH cells self-discharge at roughly 1–3% per day at room temperature. A battery stored for several months can drop below the BMS recovery threshold — typically around 8.5V for a 9.6V pack — at which point the protection circuit blocks output entirely. Place the battery on charge for a full uninterrupted cycle before attempting to power the device. If the charger does not recognise the cell, confirm input voltage is stable and retry; most charge ICs will initiate a recovery charge at low current once the cell voltage climbs above 8.5V.