Mitac Mio 339 Replacement Battery 3.7V 2400mAh BP8CULXBIAP1

Mitac Mio 339 / 339BT — 3.7V Li-ion Replacement Battery (BP8CULXBIAP1)

This 3.7V, 2400mAh Li-ion cell replaces the original battery in the Mitac Mio 339 and Mio 339BT portable GPS navigation devices. Both models use the same battery footprint and connector, sharing OEM part numbers BP8CULXBIAP1 and PVIT3800011. If your Mio 339 no longer holds a charge or powers off mid-route, this is the direct cell replacement.

• Mio 339 and 339BT compatibility: Both variants run the same 3.7V power rail and use an identical connector and BMS handshake. One cell covers both units — no firmware or hardware differences affect fitment between the standard and Bluetooth-equipped version.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Mio 339 platform. The BMS accepted the cell without fault codes, held a stable voltage curve across the full discharge, and tripped the low-voltage cutoff cleanly at the expected threshold.
• RAM data before battery removal: The Mio 339 stores active navigation data and recent route history in RAM powered directly by the main battery. Remove the cell without saving, and that data is gone. Export your routes to the SD card or connect to your PC for a full sync before pulling the battery.

Why the Mio 339 won't boot after a battery swap

The Mio 339 boot sequence requires the cell to clear a minimum voltage threshold before the device will attempt to load the OS. A brand-new cell ships at partial charge — sometimes below that threshold. If the unit shows nothing on screen or displays a battery warning immediately after installation, it has not failed. Charge the device via USB or the mains adapter for at least 30 minutes before pressing the power button.

Mio 339 dropping GPS signal or freezing mid-route

The GPS receiver and display backlight together draw significantly more current than standby, and a degraded or partially discharged cell can sag below the stable operating voltage under that combined load. This causes the device to freeze, reboot, or lose satellite lock mid-navigation. The symptom appears most often in hot vehicles where heat accelerates voltage sag. Charge fully to 4.2V before a long drive and check that the charge port is clean and making solid contact.