Troubleshooting - The charging lamp blinks on a Lumix camera.

This phenomenon may occur when charging in a location where the temperature is very high or very low, which results in the battery taking longer than usual to charge. Charge the battery in a location where the ambient temperature (and the temperature of battery) is in a 10°C to 30°C (50°F to 86°F) range.
If charging by PC, if your PC is not capable of supplying sufficient power, charging is not possible.
Check to see if the terminals of the charger or battery dirty? Wipe off the dirt using a dry cloth.
We would recommend that a genuine Panasonic battery pack is used.