COMEN NC3 Patient Monitor Compatible Battery 11.1V 2600mAh

COMEN NC3 / ECG CM300 — 11.1V Li-ion Replacement Battery (022-000066-00)

This is an 11.1V 2600mAh (28.86Wh) Li-ion replacement battery for the COMEN NC3 patient monitor and ECG CM300. Both devices use OEM part number 022-000066-00 and share the same voltage rail, connector, and BMS communication protocol. This battery is a direct fit for hospital and clinical settings where continuous vital signs monitoring depends on a functioning power source.

• NC3 and ECG CM300 compatibility: Both monitors run the same 11.1V three-cell Li-ion architecture and use identical BMS handshake logic. The same battery pack satisfies both units without any firmware or connector differences.
• Bench tested on actual hardware: We cycled this battery through charge and discharge on a clinical-grade load tester. The BMS responded correctly to charge termination and low-voltage cutoff thresholds consistent with the OEM specification.
• Post-swap self-test procedure: After installing this battery, allow the COMEN NC3 to complete its full power-on self-test without interruption. The device runs BMS verification at startup — cutting power during this sequence triggers a false battery fault that persists until the next clean reboot.

Device not completing boot sequence on new battery

The NC3 runs a startup BMS verification cycle before it reaches the main monitoring screen. A new cell that has self-discharged in storage can sit below the minimum voltage threshold the device expects at boot — typically around 10.5V for an 11.1V three-cell pack. When voltage is marginal, the monitor stalls partway through the boot sequence or restarts in a loop. Connect the device to mains power before powering on, let it charge for at least 30 minutes, then attempt a cold boot.

Low battery alarm triggers immediately after a confirmed full charge

This happens because the device's charge IC applies a conservative acceptance threshold on an unconditioned new cell — the cell voltage reads full, but the BMS has not yet learned the cell's actual capacity. The alarm trips because internal resistance on the first cycle looks elevated compared to the OEM reference. Run one complete charge-discharge cycle before clinical deployment. After that cycle, the BMS recalibrates its state-of-charge model and the false alarm clears.