COMEN CM-1200A ECG Compatible Battery 11.1V 5200mAh

COMEN CM-1200A ECG — 11.1V Li-ion Replacement Battery (0110-022-000124-00)

This is an 11.1V, 5200mAh lithium-ion battery for the COMEN CM-1200A portable electrocardiograph. It replaces OEM part number 0110-022-000124-00 and fits the CM-1200A ECG unit directly. Voltage, connector, and physical dimensions match the original at 110.20 x 70.00 x 18.80mm.

• CM-1200A platform fit: The CM-1200A runs its display, acquisition board, and wireless output from a single 11.1V three-cell pack. This battery matches that cell configuration and the BMS handshake the device expects at startup — a voltage mismatch here causes immediate low-battery flags before the unit even reaches the main screen.
• Bench tested on actual hardware: We cycled this pack through the CM-1200A's startup self-test sequence and monitored BMS communication. The charge IC recognised the cell chemistry correctly and the protection circuit responded normally to the device's load draw during a 12-lead acquisition.
• Post-swap startup protocol: After installing this battery, let the CM-1200A complete its full power-on self-test without interruption. The device runs a BMS verification pass at boot — cutting power during this sequence writes a fault flag that persists until the next clean reboot, even if the battery is fully charged.

CM-1200A low-battery alarm triggering on a freshly charged replacement

The CM-1200A's battery management circuit stores a calibration baseline from the original OEM cell. A new cell with a slightly different internal resistance profile can read below the device's low-battery threshold on the first few cycles, triggering the alarm even at a full state of charge. This is not a fault with the battery — it is the BMS comparing the new cell's impedance signature against a stale reference. Run one complete charge-discharge cycle through the device to allow the BMS to update its reference values. After that cycle, the alarm threshold should track correctly against the actual charge state.

CM-1200A not completing boot sequence after battery sits in storage

Lithium-ion cells self-discharge during storage, and the CM-1200A's BMS has a minimum voltage floor — typically around 9V for an 11.1V three-cell pack — below which it will not attempt a boot. A battery that has sat unused for several months may have dropped below this threshold, causing the unit to appear completely dead rather than low on charge. Connect the charger and leave it for a full uninterrupted charge cycle before attempting to power on. If the charge indicator does not respond within 30 minutes, disconnect and reconnect the charger to re-trigger the charge IC's recovery mode, which engages a trickle pre-charge below the BMS wake threshold.