Spring ECG-912A Compatible Battery 14.4V 2600mAh Li-ion

Spring ECG-912A — 14.4V Li-ion Replacement Battery (ICR18650-4S)

This 14.4V, 2600mAh Li-ion battery pack replaces the ICR18650-4S cell assembly in the Spring ECG-912A portable electrocardiograph. It fits the ECG-912A directly and restores power for patient examinations in clinical and portable settings. Voltage and connector match the original specification.

• ECG-912A platform fit: The ECG-912A uses a 4S 18650 cell configuration at 14.4V nominal. That voltage rail drives both the acquisition front-end and the display simultaneously. Any cell set outside that nominal range causes the device to reject the pack at BMS handshake before boot completes.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge under a load profile matching the ECG-912A's dual-rail draw. The BMS cleared fault flags on the first full cycle and held voltage within 0.2V of nominal across the discharge curve.
• Post-installation self-test protocol: After fitting this battery, let the ECG-912A complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power during this window stores a false battery fault that persists until the next clean reboot.

ECG-912A not completing boot sequence after battery swap

The ECG-912A runs a multi-stage startup check that includes a BMS state-of-charge read before the OS loads. If the replacement pack shipped with a partial charge, the device may read available capacity as below its minimum boot threshold and halt. This is not a fault with the battery — it is the device rejecting an unverified cell state. Charge the pack to full before the first insertion, confirm the charger LED shows complete, then insert and allow the full boot sequence to run without interruption.

Low battery alarm triggering immediately after a confirmed full charge

The ECG-912A's BMS compares charge state against a chemistry profile calibrated to the original cell's internal resistance. A new cell has slightly different impedance characteristics, which causes the BMS to read capacity conservatively until it builds a discharge history. This trips the low battery threshold even when the pack is physically full. Run one complete charge-discharge cycle — charge to full, use the device until it shuts down on its own, then charge to full again — and the BMS will recalibrate its threshold to the new cell. Do not use the device clinically until that first cycle is complete.