Sigma Spectrum 35083 Infusion Pump Compatible Battery 7.4V 1800mAh

Sigma Spectrum 35083 Wireless Infusion Pump — 7.4V Li-ion Replacement Battery (OM11676)

This is a 7.4V, 1800mAh Li-ion replacement battery for the Sigma Spectrum 35083 Wireless Infusion Pump (model 55075-1 and 55075-2). It also fits the Spectrum 35162 and Spectrum 35195 wireless infusion pump platforms. This is an insert-only battery — the outer housing of the original battery module is reused with this cell.

• Spectrum 35083, 35162, and 35195 platform fit: These pump models share the same 7.4V battery bay, connector pinout, and BMS communication protocol. One cell works across all three because the charge IC and handshake logic are identical across the Spectrum wireless line.
• Bench tested on actual hardware: We cycled this battery through full charge and discharge on a Spectrum pump platform. The BMS accepted the cell, completed its verification pass, and held charge across repeated draw cycles without triggering a fault condition.
• Post-swap startup protocol: After installing this battery, allow the pump to complete its full power-on self-test without interruption. The BMS runs a verification sequence at boot — cutting power during this window logs a false battery fault that persists until the next complete reboot cycle.

Spectrum pump not completing boot sequence after battery swap

The Spectrum pump runs a BMS handshake at power-on that checks cell voltage, internal resistance, and chemistry signature. A new Li-ion cell that has partially self-discharged during storage can present a voltage low enough to stall this sequence before the boot completes. This is not a faulty battery — it is a threshold check that the BMS applies before allowing the device to reach operational state. Fully charge the battery to 8.4V before the first installation, then power the pump on and allow the self-test to run to completion without interruption.

Charge indicator not reaching 100% on first charge cycle

On the first charge, the Spectrum pump's charge IC applies a conservative current limit to a cell it has not previously profiled. This causes the charge cycle to terminate at a lower state of charge than the indicator suggests is full. The cell has not been charged to its true capacity — it needs one complete charge-discharge cycle before the charge IC calibrates its cut-off threshold correctly. Run one full cycle before placing the battery into clinical rotation.