Covidien Nellcor Libra PM100N Replacement Battery 11.1V 2500mAh

Covidien Nellcor Libra PM100N — 11.1V Li-ion Replacement Battery (M-BPL-1(22))

This 11.1V, 2500mAh Li-ion battery replaces the original power cell in the Nellcor Libra PM100N pulse oximeter and the Nellcor Bedside SpO₂ Patient Monitoring System. It matches the OEM voltage rail and connector used across the PM100N platform. Capacity is 2500mAh (27.75Wh), sourced to match the original cell specification.

• PM100N and Bedside SpO₂ platform fit: Both devices share the same 11.1V three-cell Li-ion architecture, BMS handshake protocol, and physical connector. A single cell format covers both units without modification.
• Bench tested on actual hardware: We ran this battery through charge and load cycles on the PM100N platform. The BMS accepted the cell, completed its initialisation sequence, and held voltage within the device's accepted operating window under continuous SpO₂ monitoring load.
• Post-swap self-test protocol: After installing this battery, let the PM100N complete its full power-on self-test without interruption. The device runs a BMS verification check at startup — cutting power mid-sequence registers a battery fault that persists until the next clean reboot cycle.

Device not completing boot sequence after battery swap

The PM100N runs a startup BMS verification that checks cell voltage and internal resistance against stored thresholds before completing the boot sequence. A new cell straight out of packaging can read lower resting voltage than those thresholds expect, particularly after shipping in a partial state of charge. This causes the device to stall or restart mid-boot rather than reaching the monitoring screen. Charge the replacement cell fully before the first installation — the battery should present at least 12.4V before insertion to pass the initial BMS check.

Low battery alarm triggering immediately after confirmed full charge

This happens because the PM100N's charge IC applies a conservative acceptance threshold calibrated to an OEM cell with an established charge history. A new Li-ion cell has not yet completed its first full electrochemical cycle, so the BMS reports capacity below the alarm trigger even when the cell is physically full. Run one complete charge-to-discharge-to-charge cycle before relying on the battery indicator in clinical use. After that conditioning cycle, the BMS recalibrates its capacity estimate and the alarm threshold aligns correctly with actual cell state.