Zoncare ATOM ECG-6A Replacement Battery 14.8V 2600mAh

Zoncare ATOM ECG-6A / ZQ-1206 — 14.8V Li-ion Replacement Battery (HYLB-1171)

This is a 14.8V, 2600mAh Li-ion replacement for the Zoncare ATOM ECG-6A and ZQ-1206 portable electrocardiographs. It replaces OEM part number HYLB-1171 directly. Both models run the same voltage rail and use the same BMS communication protocol.

• ECG-6A and ZQ-1206 compatibility: Both devices share the HYLB-1171 form factor, 14.8V nominal voltage, and the same four-pin connector with BMS data line. A battery that passes handshake on one will pass on the other — the charge IC reads cell chemistry the same way across both units.
• Bench tested on actual hardware: We ran this cell through the ECG-6A power-on sequence and monitored BMS handshake on the data line. The charge controller accepted the cell on first insertion, and the self-test cycle completed without a fault flag.
• Post-swap startup protocol: After fitting this battery, let the device complete its full power-on self-test without pressing any buttons or connecting a patient lead. Medical-grade BMS firmware runs a cell verification check at boot — interrupting it locks in a false battery fault that won't clear until a clean reboot from a full-charge state.

Device not completing boot sequence after battery swap

The ECG-6A runs a BMS learn cycle on first use with a new cell. If the device powers off, reboots, or receives a keypress during that initial self-test, the firmware logs a battery authentication fault. This fault persists across subsequent power cycles because the BMS hasn't stored a confirmed capacity baseline. Charge the battery to full, then power on and leave it untouched through the entire boot sequence — typically 15–20 seconds — before use.

Charge indicator stalling below 100% on the first charge

New Li-ion cells ship at a partial state of charge, and the ECG-6A charge IC applies a conservative current limit on an unrecognised cell until it reads a full voltage profile. This causes the charge bar to slow significantly above 80% and sometimes stall at 95–98% on the first cycle. This is not a fault — it clears after one complete charge-to-discharge-to-full cycle. After that first cycle the charge IC recalibrates and the indicator tracks correctly to 14.8V full charge.