XTOOL EZ500HD Replacement Battery 7.4V 4000mAh Li-Polymer

XTOOL EZ500HD Heavy Duty / PS80 Scan Tool — 7.4V Li-Polymer Replacement Battery (7069124-25)

This 7.4V, 4000mAh Li-Polymer battery replaces the original pack in the XTOOL EZ500HD Heavy Duty, EZ500 Gasoline, PS80 Scan Tool, and PS80 Automotive Scan Tool. It matches the OEM part number 7069124-25 and the same 125.60 x 66.60 x 8.00mm form factor. Voltage and capacity are matched to the original spec so the scanner's power management system behaves as expected after the swap.

• EZ500HD and PS80 platform compatibility: Both the EZ500 series and PS80 series share the same 7.4V battery rail, connector pinout, and BMS handshake protocol — that's why a single cell services all four listed models without modification.
• Bench tested on actual hardware: We cycled this cell through the EZ500HD boot sequence and ran a live OBD session. The BMS held a steady discharge curve, passed the scanner's low-voltage warning threshold correctly, and shut down cleanly at the expected cutoff without triggering a hard fault.
• Data export before swap: The EZ500HD stores saved vehicle profiles and session logs in RAM backed by the main battery. Pull all vehicle data to an SD card or USB before disconnecting the old pack — once the cell drops below hold voltage, that data is gone.

Why the EZ500HD won't boot after a fresh battery install

A new Li-Polymer cell ships at a storage charge of roughly 3.7–3.8V per cell — well below the 7.4V nominal the EZ500HD needs to clear its boot threshold. The scanner's firmware checks cell voltage before allowing the OS to load, and a low-charge pack will stall it at a blank screen or a flashing charge indicator. Connect the scanner to the OEM charger for at least 30 minutes before the first power-on attempt. Once the pack reads above 7.0V, the boot sequence completes normally.

Wireless link dropping mid-diagnostic session

The EZ500HD's Bluetooth and Wi-Fi modules draw a current spike during active vehicle communication that the scanner's power regulator has to cover from the battery. When cell voltage sags below roughly 6.8V under that load, the wireless module resets to protect the processor — this appears as a sudden disconnection mid-session with no error code. It's not a software fault. Charge the battery to full before starting any extended diagnostic session, and watch the battery indicator if the link keeps dropping — voltage sag under radio load is the cause, not the radio itself.