Mitac Mio P350 Compatible Battery 3.7V 1250mAh 541380530006

Mitac Mio P350 / P510 / P550 Series — 3.7V Li-ion Replacement Battery (541380530006)

This 3.7V, 1250mAh Li-ion cell replaces the original battery in the Mitac Mio P350, P510, P550, and P550m portable GPS navigators. It matches the OEM form factor at 50.00 × 36.60 × 6.60mm and slots into the same battery bay without modification. Voltage and capacity figures are taken directly from the product specification — 4.63Wh total energy.

• P350 / P510 / P550 platform fit: These models share the same battery footprint, connector pinout, and 3.7V nominal voltage rail across the series. The BMS on each unit communicates charge state the same way, so one cell covers the full group without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on GPS-class hardware, confirmed the BMS accepted the cell without error flags, and verified the protection circuit trips correctly at undervoltage before cell damage occurs.
• Cold-start satellite acquisition after fitting: After a full power removal, the GPS unit loses its ephemeris data and must perform a cold start. Take the device outdoors immediately after fitting and power it on — first satellite fix typically takes 5–10 minutes. Subsequent warm starts drop that to under a minute.

GPS accuracy reduced as battery level drops on the Mio P350

The Mio P350 GPS receiver draws continuous power to maintain satellite tracking, and some navigation units reduce receiver sensitivity at low battery to protect remaining charge. This shows up as position drift or delayed route recalculation, even when the unit appears to still be on. The symptom is most noticeable on long drives with the display at full brightness and no USB power connected. Keeping cell voltage above 3.5V during active navigation avoids the sensitivity reduction entirely.

Mio P350 shuts off without warning before the battery indicator reaches empty

This happens because the battery indicator on the P350 is calibrated to the original cell's discharge curve. A new cell — or any cell with slightly different internal resistance — hits the unit's low-voltage cutoff threshold before the on-screen gauge reads zero. The device sees the correct shutdown voltage at the protection circuit but the fuel gauge hasn't caught up. Run two or three full charge-to-cutoff cycles and the indicator recalibrates to within one bar of accuracy. If the unit cuts out abruptly, charge immediately to 4.2V and cycle again.