XTOOL EZ300 Replacement Battery 3.7V 2200mAh Li-Polymer

XTOOL EZ300 / EZ400 / PS65 / PS70 Series — 3.7V Li-Polymer Replacement Battery (PL3265100)

This is a 3.7V 2200mAh lithium-polymer battery for the XTOOL EZ300, EZ400, PS65, PS70, and related portable automotive diagnostic scanners. It replaces OEM part number PL3265100. The battery fits the internal bay on these handheld OBD scanner units and connects via the original flex-cable harness.

• EZ300 / EZ400 / PS65 / PS70 platform fit: These models share the same 3.7V cell format, connector pinout, and BMS handshake protocol, which is why a single cell covers the full range. The battery management circuit communicates charge state to the scanner's firmware using the same data line across all four variants.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a compatible scanner unit. The BMS accepted charge from the OEM dock without fault flags and reported accurate state-of-charge to the scanner's status display throughout the cycle.
• Vehicle profile export before swap: Export all saved vehicle profiles and scan history to the SD card or connected PC before removing the battery. On these XTOOL models, vehicle session data is held in RAM backed by the main cell — pulling the battery without exporting will wipe that data permanently.

Why the EZ300 won't boot after a battery replacement

A freshly swapped cell ships at storage charge — typically 30–50% of capacity. The EZ300's boot controller requires a minimum cell voltage to initialise the scanner firmware and display driver. If voltage sits below that threshold, the unit appears completely dead even though the battery and hardware are both functional. Charge the scanner for at least 30 minutes via the OEM dock or a 5V USB-C source before attempting the first power-on after the swap.

Wireless link dropping mid-diagnostic session

On the EZ300 and EZ400, the Bluetooth and Wi-Fi radio draws a short high-current burst each time it re-transmits vehicle data. When the cell voltage sags — common in a degraded original battery — the radio's power rail dips below the stable operating threshold and the link resets. This shows up as the scanner losing the vehicle connection mid-session rather than showing a low-battery warning. Replacing the cell restores the voltage headroom the radio needs; if dropouts continue, check that the dock is providing a steady 5V output to confirm the issue is isolated to the cell.