Biocare HYLB-952 ECG-1215 Replacement Battery 14.8V 2600mAh

Biocare ECG-1215 — 14.8V Li-ion Replacement Battery (HYLB-952)

This is a 14.8V, 2600mAh Li-ion replacement battery for the Biocare ECG-1215 portable electrocardiograph. It replaces OEM part HYLB-952. The ECG-1215 is a clinical-grade device used for 12-lead cardiac rhythm monitoring in hospital wards, clinics, and mobile diagnostic settings.

• ECG-1215 platform fit: The ECG-1215 uses a 14.8V four-cell Li-ion pack with a BMS that checks cell group voltages and temperature at startup. This replacement matches that voltage rail and connector pinout. The BMS handshake runs on power-on, not mid-session, so the pack either clears self-test or flags a fault before the device reaches the recording screen.
• Bench tested on actual hardware: We cycled this pack through full charge-discharge runs on the ECG-1215 platform and confirmed the BMS cleared all self-test checks without triggering a battery fault. Cell balancing completed correctly across all four groups after the first full cycle.
• Post-swap startup protocol: After installing this battery, let the device run its full power-on self-test without pressing any buttons or cycling power. The ECG-1215 BMS runs a voltage verification sequence at boot. Interrupting that sequence logs a false battery fault that stays flagged until the next clean reboot from a fully charged state.

Why the ECG-1215 BMS flags a new battery as faulty on first boot

The ECG-1215 BMS compares each cell group voltage against a stored threshold calibrated to the OEM cell chemistry. A new replacement cell ships at a partial state of charge, and its resting voltage curve does not yet match the learned profile from the original pack. This mismatch can trigger a low-battery or battery-fault warning on the first one or two boot cycles. Running one complete charge-discharge cycle lets the BMS re-characterise the pack and update its internal thresholds. After that cycle, the fault flag clears and does not return.

Charge indicator stalling below 100% on the ECG-1215

The ECG-1215 charge IC applies a conservative taper current when it detects a new or unfamiliar cell pack — this is a built-in protection behaviour, not a fault. The charge cycle extends longer than normal on the first charge as the IC holds a lower termination threshold. Do not disconnect the charger early. Let the charge run to natural termination. After the first full charge, the IC updates its end-of-charge detection and subsequent charges complete to a full 16.8V termination voltage as expected.