About this replacement
OSEN ECG-8112 — 14.8V Li-ion Replacement Battery (WP-AST-102A)
This is a 14.8V 2600mAh Li-ion battery for the OSEN ECG-8112 portable electrocardiograph. It matches the OEM part number WP-AST-102A and fits directly into the ECG-8112 battery compartment. Use it when AC power is unavailable during patient examinations or when the original cell no longer holds a charge.
- ECG-8112 platform compatibility: The ECG-8112 uses a 14.8V four-cell Li-ion pack with a BMS that validates cell voltage and chemistry at startup. This replacement matches that voltage rail and communicates with the device BMS so the unit clears its power-on self-test without a fault flag.
- Bench tested on actual hardware: We cycled this cell through a full charge-discharge sequence and monitored the BMS handshake at startup. The protection circuit responded correctly to load spikes and cutoff thresholds matched the ECG-8112 firmware expectations.
- Startup sequence care: After installation, let the device complete its full power-on self-test without interruption. The ECG-8112 runs a BMS verification routine at boot — cutting power mid-sequence registers a battery fault that persists until the next clean reboot cycle.
Why the ECG-8112 flags a low battery alarm immediately after a confirmed full charge
The ECG-8112 BMS stores a capacity baseline from the previous cell. A new cell arrives with a different internal resistance profile, so the BMS misreads state-of-charge on the first cycle. The alarm clears after one complete charge-discharge cycle — the BMS recalibrates its thresholds against the actual cell chemistry. Run that conditioning cycle before clinical use, and the low battery flag will not reappear.
ECG-8112 not powering on after the replacement battery sat in storage
Li-ion cells self-discharge in storage. If this battery shipped or sat unused for several months, cell voltage can drop below the ECG-8112 BMS recovery threshold — typically around 10.0–10.5V for a 14.8V four-cell pack. The BMS locks out power delivery as a protection measure and will not respond to a normal press of the power button. Connect the device to AC mains first and leave it on charge for 30–40 minutes to allow the charge IC to trickle the cell voltage back above the recovery threshold before attempting to power on.