Topdon ArtiMINI Scan Tool Replacement Battery 3.8V 3500mAh

Topdon ArtiMINI Scan Tool — 3.8V Li-Polymer Replacement Battery (PR-348594N)

This is a 3.8V, 3500mAh Li-Polymer battery for the Topdon ArtiMINI portable automotive diagnostic scanner. It replaces part number PR-348594N when the original cell can no longer hold a charge or fails to boot the device. Capacity and voltage match the OEM specification exactly.

• ArtiMINI platform fit: The ArtiMINI uses a slim Li-Polymer cell with a specific connector orientation and BMS handshake that gates power to the OBD communication module. A mismatched cell voltage or incorrect BMS protocol causes the scanner to refuse to boot, even with apparent charge. This cell matches the connector pinout and BMS identification used by the ArtiMINI.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the ArtiMINI platform and confirmed the BMS accepted the cell without triggering a low-voltage lockout or throwing a power fault on the status screen.
• Pre-swap data export: The ArtiMINI stores vehicle profiles and diagnostic session logs in memory powered by the main battery. Pull all saved vehicle data to an external device via the Topdon app before disconnecting the old cell — swapping the battery clears that storage.

Why the ArtiMINI BMS blocks startup on a freshly installed cell

Li-Polymer cells can leave the supply chain with a resting voltage below the ArtiMINI's boot threshold, which sits around 3.4V on this platform. The BMS interprets anything under that floor as a damaged or deeply discharged cell and refuses to initialise. This is a protection circuit decision, not a faulty battery. Connect the scanner to a charger for at least 20 minutes before pressing the power button — once the cell clears 3.5V, the BMS releases and the device boots normally.

Wireless connection dropping mid-diagnostic session

The ArtiMINI's Bluetooth and WiFi stack draws additional current during active vehicle communication, and a degraded battery causes the supply voltage to sag enough for the wireless radio to drop the link. This shows up as the scanner freezing mid-scan or returning an incomplete report, even though the battery indicator still reads 30–40%. Replacing the cell restores the voltage headroom the radio needs to sustain the connection. After fitting this battery, run a full charge to 4.35V before starting a live diagnostic session.