Kangtai ECG-1200 Replacement Battery 14.8V 4000mAh

Kangtai ECG-1200 / ECG-1200G — 14.8V Li-Polymer Replacement Battery

This 14.8V, 4000mAh (59.2Wh) lithium-polymer battery replaces the original power cell in the Kangtai ECG-1200 and ECG-1200G portable electrocardiograph. Both units share the same battery bay, connector pinout, and BMS handshake protocol. It fits clinical and ambulatory ECG workflows where the device operates away from mains power for extended periods.

• ECG-1200 and ECG-1200G compatibility: Both models run the same 14.8V four-cell Li-Polymer architecture with an identical BMS communication line. The battery management circuits on each unit expect the same cell chemistry, capacity register, and charge termination voltage — so one cell fits both without configuration changes.
• Bench tested on actual hardware: We cycled this cell through charge-discharge on the ECG-1200 platform and monitored BMS handshake traffic. The protection circuit engaged correctly at low-cell cutoff, and the charge IC terminated cleanly at 16.8V with no false fault flags logged.
• Post-swap self-test protocol: After installing this battery, allow the ECG-1200 to complete its full power-on self-test without interruption. The device runs a BMS verification pass at startup — cutting power during this sequence stores a false battery fault in memory that will persist until the next clean reboot cycle.

Why the ECG-1200 reports a battery fault on a cell that bench-reads full

The ECG-1200's BMS uses a learned capacity register to track state-of-charge. A new cell arrives with a blank or default register, so the device has no charge history to reference. Until one complete charge-discharge cycle is logged, the BMS applies a conservative threshold and may flag the cell as degraded even when terminal voltage reads 16.8V. Running one full cycle — charge to termination, discharge under normal clinical load, then recharge — writes the baseline data the BMS needs to report status accurately.

Charge indicator stuck below 100% on the first charge after swap

On a fresh lithium-polymer cell, the ECG-1200 charge IC applies a reduced current limit during the first charge cycle as a conservative safety measure for unconditioned cells. This causes the charge progress indicator to plateau — often between 85% and 95% — before the cycle completes. The cell is not faulty. Let the charge cycle run to natural termination without interrupting it. On the second full charge, the IC lifts the limit and the indicator reaches 100% normally.