XTOOL PS2 Heavy Duty Diagnostic Scanner Replacement Battery 7.4V 4000mAh

XTOOL PS2 Heavy Duty Truck Diagnostic Tool — 7.4V Li-Polymer Replacement Battery (PL3769124 2S)

This 7.4V 4000mAh Li-Polymer battery replaces the original cell in the XTOOL PS2 Heavy Duty Truck Diagnostic Tool and PS2 GDS Gasoline scanner. At 29.6Wh, it matches the OEM capacity specification. Swap it when the original cell no longer holds a charge or the device shuts down mid-session.

• PS2 HD and PS2 GDS compatibility: Both the Heavy Duty Truck and GDS Gasoline variants of the PS2 share the same battery bay dimensions, connector pinout, and BMS handshake protocol — which is why a single cell covers both platforms.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the PS2 platform. The BMS accepted the pack without error flags, voltage regulation held steady across the display and wireless modules, and the charge circuit terminated cleanly at 8.4V.
• Export vehicle data before swapping: The PS2 stores active vehicle profiles and session logs in RAM backed by the main battery. Pull the battery without exporting first and that data is gone. Use the PS2's export function to push all profiles to a USB drive or paired PC before removing the old cell.

Why the PS2 drops its wireless link during live data streaming

The PS2's Bluetooth and Wi-Fi modules draw a short current spike when maintaining a live data stream to a PC or tablet. When the battery sags below roughly 6.8V under that load, the wireless subsystem loses enough voltage headroom to hold the link. The screen may still show a charge bar because the display driver cuts off at a lower threshold than the radio. Fitting a fresh 4000mAh cell restores the voltage margin the radio needs to stay connected through an entire diagnostic session.

PS2 screen dimming before the battery indicator shows low

The PS2 display backlight driver is voltage-sensitive and begins stepping down brightness when cell voltage drops below approximately 7.0V — several percentage points before the on-screen battery gauge triggers a low warning. If the screen dims noticeably during use but the battery icon still reads above 20%, the cell has aged enough that its resting voltage no longer reflects its true state under load. Confirm this by reading cell voltage under load with a multimeter at the battery connector — a healthy cell at half charge should hold above 7.2V. Replace the cell if voltage sags below 7.0V with the scanner active.