About this replacement
COMEN CM600 Patient Monitor — 14.4V Li-ion Replacement Battery (JHT-99K-00)
This 14.4V, 2600mAh Li-ion battery replaces part number JHT-99K-00 in the COMEN CM600 portable patient monitor. It fits both the CM600 and CM-600 variants. The CM600 runs continuous multi-parameter monitoring — ECG, SpO2, NIBP, and temperature — drawing a consistent load that degrades original cells over time.
- CM600 and CM-600 compatibility: Both model designations use the same 14.4V battery bay, connector pinout, and BMS handshake protocol. A single replacement cell covers either unit without modification.
- Bench tested on actual hardware: We cycled this cell through the CM600's power-on self-test and multi-parameter load profile. The BMS completed charge verification and passed state-of-charge reporting to the device without triggering a battery fault.
- Post-installation self-test requirement: After fitting this battery, allow the CM600 to complete its full power-on self-test without interruption. The device runs BMS verification at startup — cutting power during this sequence registers a false battery fault that persists until the next complete reboot.
CM600 not completing boot sequence after battery swap
The CM600 runs a BMS learn cycle at first power-on with a new cell. If the cell voltage sits below 13.0V after storage, the device may stall mid-boot or refuse to start entirely. This is a low-voltage lockout, not a failed battery. Connect the monitor to mains power first, allow the cell to charge to at least 14.0V, then attempt a cold boot from AC power before switching to battery-only operation.
CM600 alarming low battery immediately after a confirmed full charge
The CM600's charge indicator reaching 100% does not mean the BMS has completed its calibration with a new cell. On the first charge cycle, the BMS applies a conservative capacity threshold tuned to aged OEM chemistry — a fresh cell can read as low-capacity until one full charge-discharge cycle recalibrates the state-of-charge register. Run the monitor on battery until the low-battery alarm sounds naturally, then charge to full without interruption. The false low-battery alarm clears after this single conditioning cycle.