Covidien Nellcor Libra PM100N 10.8V Replacement Battery

Covidien Nellcor Libra PM100N — 10.8V Li-ion Replacement Battery (M-BPL-1(22))

This 10.8V 4400mAh Li-ion battery replaces the OEM pack in the Covidien Nellcor Libra PM100N pulse oximeter and the Nellcor Bedside SpO₂ Patient Monitoring System. It cross-references OEM part numbers including M-BPL-1(22), 31CR18/65-2, M6044-1, M6044-2, and HBP-2070. Capacity is 4400mAh (47.52Wh) — matching the original cell specification.

• PM100N and Bedside SpO₂ system compatibility: Both the Libra PM100N and the Nellcor Bedside SpO₂ Patient Monitoring System draw from the same 10.8V rail and use identical connector geometry and BMS handshake protocol. The same pack services both platforms without modification.
• Bench tested on actual hardware: We cycled this battery through the PM100N's startup sequence and monitored the BMS communication loop. The charge IC accepted the cell without fault codes, and the BMS reported state-of-charge correctly by the end of the first full cycle.
• Post-swap power-on sequence: After installing this battery, let the PM100N complete its full power-on self-test without interruption. The device runs a BMS verification step at boot — cutting power mid-sequence registers a false battery fault that persists until the next clean reboot.

PM100N not completing boot sequence on a new battery

The Nellcor PM100N runs a BMS verification handshake during its boot sequence before it clears to operate. A new cell that hasn't completed one full charge-discharge cycle may report a state-of-charge value the device firmware treats as out-of-range, stalling the boot. This isn't a faulty battery — it's the BMS learn cycle not yet initialised. Charge the battery to full, power the device on, and allow the self-test to complete without interruption before clinical use.

Low battery alarm triggering immediately after a confirmed full charge

The PM100N's low-battery alarm threshold is calibrated to OEM cell chemistry, and a new third-party cell can read slightly below the expected voltage curve on the first cycle even when fully charged. The BMS hasn't yet characterised the new cell's discharge profile, so it flags an early alarm. Run one complete charge-discharge cycle on the device before clinical deployment. After that cycle the BMS recalibrates and the alarm threshold tracks correctly — confirm the cell reads above 10.0V under load before clearing it for patient use.