Mitac Mio Spirit 8500 LM GPS Compatible Battery 3.7V 1100mAh

Mitac Mio Spirit 8500 LM — 3.7V Li-ion Replacement Battery (523450A1)

This 3.7V 1100mAh Li-ion cell replaces the original 523450A1 battery in the Mio Spirit 8500 LM portable GPS navigator. It fits the exact footprint of the factory cell at 54.92 × 34.10 × 5.56mm. If your Spirit 8500 LM is shutting off mid-route or refusing to hold a charge, this swap restores full operation.

• Mio Spirit 8500 LM fit: The 523450A1 cell is specific to this navigator's internal bay dimensions and connector orientation. The voltage rail matches the original at 3.7V nominal, so the device's power management circuit recognises the cell without any calibration step.
• Bench tested on actual hardware: We ran the battery through charge and discharge cycles on the Spirit 8500 LM platform and confirmed BMS cutoff engaged cleanly at both the low-voltage floor and charge termination ceiling, with no false trips at steady GPS-receiver draw.
• Cold-start satellite acquisition after fitting: After fitting this cell, power the unit on outdoors and let it run until it acquires a satellite fix before driving. GPS units perform a full cold start after a complete power removal — first fix can take 5–10 minutes compared to under a minute on subsequent warm starts.

GPS accuracy reduced as battery level drops on the Spirit 8500 LM

The Spirit 8500 LM's GPS receiver draws steady current to maintain satellite signal processing. At low cell voltage — typically below 3.4V — some navigation units reduce receiver sensitivity to protect the remaining charge, which can widen position error. This shows up as the blue dot drifting off road or position jumping between fixes. Keeping the cell above 3.6V during active navigation avoids the sensitivity reduction entirely.

Spirit 8500 LM shuts off without warning before the battery indicator reaches empty

This happens because the on-screen battery gauge is calibrated to the original cell's discharge curve. A new cell — or a degraded one — can have a slightly different voltage-to-capacity relationship, so the device hits its hardware low-voltage cutoff before the visual indicator reaches zero bars. The fix is to run two or three full charge-to-cutoff cycles after fitting the new battery. This allows the device's fuel gauge logic to re-map the discharge curve and give accurate warnings at around 3.5V remaining.