Medion MD-95780 GPS Navigator Replacement Battery 3.7V 1200mAh

Medion MD-95780 — 3.7V Li-ion Replacement Battery

This 3.7V 1200mAh Li-ion cell replaces the original battery in the Medion MD-95780 portable GPS navigator. It fits directly into the device's battery bay and restores power to the navigation unit. Capacity matches the original at 1200mAh (4.44Wh).

• MD-95780 fit: The MD-95780 uses a single-cell 3.7V Li-ion pack at this compact form factor — 50.04 × 36.39 × 6.33mm. The replacement shares that footprint and voltage rail, so the onboard protection circuit reads the cell correctly without triggering a fault state.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS accepted the cell without a voltage rejection error, and the protection circuit engaged at the correct cutoff threshold on discharge.
• Cold-start satellite acquisition after swap: After fitting this cell, power the GPS fully on outdoors before driving. A full power interruption clears the receiver's ephemeris cache, triggering a cold start — first satellite fix after a swap takes 5–10 minutes. Subsequent power cycles fix in under a minute once the cache rebuilds.

GPS accuracy reduced as battery drops below 3.5V

Some GPS units step down receiver sensitivity when the cell voltage falls below a set threshold — typically around 3.5V on a 3.7V nominal cell. The unit stays on and displays a route, but satellite signal strength drops noticeably and position accuracy degrades. This is a firmware-level power-saving response, not a hardware fault. Keeping the battery charged above 3.6V during active navigation prevents the sensitivity reduction from triggering.

MD-95780 shuts off without warning before the low-battery icon appears

The battery indicator on the MD-95780 reads estimated charge based on voltage, and a degraded original cell can cause the calibration to drift — the device shows two bars and then cuts off immediately. A fresh cell resets the voltage curve the indicator reads from. After fitting the new battery, run one full charge cycle to let the device re-anchor its low-voltage cutoff reference. If the unit shuts off unexpectedly, check that charge voltage reached 4.2V before first use.