About this replacement
COMEN CM-1200A ECG — 11.1V Li-ion Replacement Battery (0110-022-000124-00)
This is an 11.1V 6400mAh Li-ion replacement battery for the COMEN CM-1200A portable electrocardiograph. It replaces OEM part number 0110-022-000124-00. The CM-1200A is a clinical ECG machine used for 12-lead cardiac monitoring and rhythm analysis in hospitals and outpatient settings.
- CM-1200A platform fit: The CM-1200A uses a fixed 11.1V three-cell Li-ion pack with a BMS that handshakes with the device charge controller on startup. This replacement matches that voltage rail and connector pinout exactly, so the charge IC recognises the pack and initiates the standard charge profile without throwing a fault.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the CM-1200A platform. The BMS passed the device self-test on the second cycle after the initial conditioning charge, and the charge controller reported a clean state-of-health flag from the third cycle onward.
- Post-swap startup protocol: After installing this battery, let the CM-1200A complete its full power-on self-test without powering the device off mid-sequence. The BMS runs a verification routine at boot — interrupting it triggers a persistent false battery fault that will not clear until the next complete restart from a fully charged state.
Why the CM-1200A flags a battery fault on the first boot after a swap
The CM-1200A runs a BMS self-test on every cold boot to verify cell voltage balance and internal resistance against stored OEM thresholds. A brand-new cell has a slightly higher internal resistance than a conditioned cell, so it can fall outside the pass window on the first check. This is not a defect — it is the device applying a clinical-grade verification standard to an unconditioned pack. Run one full charge-to-discharge cycle before relying on the battery in a patient examination setting, and the self-test will pass consistently from that point.
Charge indicator stuck below 100% on the first charge
On the first charge cycle, the CM-1200A charge IC applies a conservative current limit when it detects a new or cold cell pack — this is intentional. The indicator can stall between 90% and 98% for an extended period before the final top-off completes. Do not unplug the device during this phase. Leave it on charge until the indicator moves to 100% or the green ready light activates, then discharge fully and recharge once more to allow the charge IC to calibrate its capacity estimate to this specific pack.