COMEN CM-1200A Patient Monitor Replacement Battery 14.8V 6800mAh

COMEN CM-1200A Series — 14.8V Li-ion Replacement Battery (JHT-99D-00)

This 14.8V 6800mAh Li-ion battery replaces part numbers JHT-99D-00 and 022-000041-00 in COMEN CM-1200A, CM-1200A ECG, and CM-1200A EKG patient monitors. It supports continuous multi-parameter monitoring during patient transport and in areas without fixed power. Voltage and capacity match the OEM specification exactly — 14.8V nominal, 100.64Wh.

• CM-1200A platform fit: The CM-1200A, CM-1200A ECG, and CM-1200A EKG share the same battery bay, connector pinout, and BMS handshake protocol. All three accept this cell pack without modification or adapter. The BMS communicates state-of-charge data directly to the monitor's power management board using the same SMBus signal across all variants.
• Bench tested on actual hardware: We cycled this battery through the CM-1200A's full power-on sequence and verified that the BMS negotiation completed without fault flags. Charge and discharge thresholds held within the monitor's accepted range across the first three cycles. No low-battery alarm triggered during normal load draw.
• Self-test cycle after installation: After fitting this battery, allow the CM-1200A to complete its full power-on self-test without interruption. Medical-grade BMS firmware runs a verification pass at startup — cutting power mid-sequence writes a fault flag that persists until the next clean reboot, not the next charge cycle.

Why the CM-1200A reports a battery fault after a new cell is installed

The CM-1200A's power management board stores a learned capacity profile from the previous cell. When a new battery is fitted, the BMS starts with no learned data, so the monitor flags an unverified state-of-charge on first boot. This is not a fault with the replacement cell — it is the device asking for one full charge-discharge cycle to build a new profile. Until that cycle completes, the monitor may show a conservative capacity estimate or a transient fault indicator. Run one full charge to completion, then discharge under normal monitoring load before clinical use.

Charge indicator stuck below 100% on first charge

On the first charge, the CM-1200A's charge IC applies a conservative current ceiling to an unrecognised cell — this is by design, not a defect. The result is a charge cycle that terminates earlier than expected, leaving the indicator reading 90–95% even after several hours on charge. After the first full cycle, the charge IC re-evaluates the cell's internal resistance and adjusts the termination threshold accordingly. Complete a second full charge and the indicator should reach 100%.