Baxter Healthcare Spectrum Infusion Pump Compatible Battery 7.4V 1800mAh

Baxter Healthcare Spectrum Infusion Pump (35702 35724) — 7.4V Li-ion Replacement Battery (OM11676)

This is a 7.4V 1800mAh Li-ion battery for the Baxter Healthcare Spectrum Infusion Pump, models 35702 and 35724. It replaces the internal insert-only cell that powers the pump during IV fluid and medication delivery. OEM part numbers OM11676, AS36296, S00273, and 55075-2 all cross to this unit.

• Spectrum 35702 and 35724 compatibility: Both models use the same insert-only battery bay, voltage rail, and BMS handshake protocol. The connector and cell dimensions — 70.50 x 50.90 x 10.60mm — match the original housing without modification.
• Bench tested on actual hardware: We cycled this cell through the Spectrum pump's charge-discharge sequence and confirmed the BMS accepted the cell, passed its internal verification, and held charge across multiple draw cycles without triggering a fault state.
• Post-installation self-test protocol: After inserting the battery, let the pump complete its full power-on self-test without interruption. The BMS runs a chemistry verification routine at startup — cutting power mid-sequence flags a false battery fault that won't clear until the next clean reboot.

Spectrum pump not completing boot sequence on a new battery

The Spectrum pump's BMS applies a strict verification window during boot. A new cell that hasn't completed its first full charge-discharge cycle may not hit the voltage threshold the BMS expects at startup. This causes the pump to stall mid-boot or display a battery error even when the cell reads charged. Run one complete charge cycle on the new battery before attempting clinical use — the BMS learn cycle sets the reference baseline the pump checks against on every subsequent boot.

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

The Spectrum pump's charge IC applies a conservative current limit when it first encounters a new cell. This is normal behaviour — the charge controller hasn't established the cell's internal resistance profile yet and holds back to avoid overstress. The indicator typically stalls between 90–95% on the first charge. Run the pump through one full charge-discharge cycle and the charge IC recalibrates; subsequent charges reach 100% as expected.