About this replacement
EDANINS ECG-12A/12B/12C — 14.4V Li-ion Replacement Battery (HYHB-1188)
This is a 14.4V, 2200mAh Li-ion battery for the EDANINS ECG-12A, ECG-12B, and ECG-12C portable electrocardiographs. These devices are used in clinical and ambulatory settings for 12-lead cardiac rhythm monitoring and diagnostic recording. OEM part numbers HYHB-1188 and HYLB-1188 both apply to this cell configuration.
- ECG-12 series compatibility: The 12A, 12B, and 12C share the same 14.4V battery bay, connector pinout, and BMS handshake protocol. All three models pull from the same power rail, so one cell fits all without modification.
- Bench tested on actual hardware: We ran this battery through charge and load cycling on the ECG-12 platform. The BMS passed the startup self-test, accepted a full charge cycle, and held steady voltage under the device's continuous acquisition load.
- Post-swap startup procedure: After installing this battery, allow the ECG-12 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at boot. Cutting power during this step logs a false battery fault that persists until the next clean reboot.
ECG-12 not completing boot sequence on a new battery
The ECG-12 runs a BMS learn cycle on first use. If the cell has been in storage, its resting voltage may sit just above the BMS recovery floor, which can cause the boot sequence to stall or abort before the main interface loads. This is not a dead battery — it is the charge IC applying a conservative pre-charge current to a low cell before handing off to the main BMS. Connect the device to mains, let it charge uninterrupted for a full cycle, then power on. After one complete charge-discharge cycle, the BMS learn table updates and the boot sequence completes normally.
Low battery alarm triggers immediately after a confirmed full charge
The ECG-12's BMS compares cell impedance and voltage recovery against thresholds calibrated to the original OEM cell chemistry. A new replacement cell has not yet completed the formation cycles that lower its internal impedance to match those thresholds. On first use, the device may read the new cell as below the alarm floor even if the charge indicator showed 100%. Run one full charge-discharge cycle before clinical use. After that cycle, impedance drops, the BMS recalibrates, and the alarm clears at the correct state of charge.