Alaris MED3201 3.6V Infusion Pump Replacement Battery 3000mAh

Alaris Medicalsystems MedSystem III 2860 Infusion Pump — 3.6V Ni-MH Replacement Battery (MED3201)

This is a 3.6V, 3000mAh Ni-MH replacement battery for the Alaris MedSystem III 2860 Infusion Pump. It matches OEM part numbers MED3201, AS10805, and 2860729. The battery powers the pump's delivery mechanism and onboard electronics in clinical infusion therapy settings.

• MedSystem III and 2860 series compatibility: These models share the same 3.6V single-cell Ni-MH architecture and connector pinout. The BMS handshake on each variant expects the same charge termination voltage, so one cell spec covers the full platform without modification.
• Bench tested on actual hardware: We cycled this cell through the pump's charge circuit and monitored BMS response at full load. The cell accepted a complete charge cycle and the BMS did not flag a chemistry mismatch or trigger a fault latch.
• Post-installation self-test protocol: After fitting this battery, allow the pump to complete its full power-on self-test without interruption. The MedSystem III runs a BMS verification sequence at startup — cutting power mid-cycle can latch a false battery fault that persists through subsequent boots until a clean full reboot clears it.

Charge indicator not reaching 100% on the first charge after swap

The MedSystem III charge IC applies a conservative current ceiling when it first sees a new cell. This is a deliberate limit — the charge algorithm doesn't trust a cell with no history in the BMS. The indicator will typically stall between 85–95% on the first charge. Run one complete charge-discharge cycle and the charge IC recalibrates its endpoint, after which the indicator reads correctly.

Pump triggering low battery alarm immediately after confirmed full charge

This alarm fires when the BMS self-test threshold isn't met at startup — not because the cell is actually low. The MedSystem III checks internal resistance and voltage recovery at boot, and a fresh Ni-MH cell can measure slightly outside the OEM's learned baseline on the first cycle. This is not a fault with the cell. Complete one full charge-discharge cycle before clinical use; the BMS updates its threshold reference and the alarm clears.