My 997S has been hanging at the "Porsche Charg-o-mat I infusion" for about 3 weeks.

This morning when I checked it in the garage, there was no light on on the charger. When I pull the carger out of the outlet and re-insert it, the red light comes on just quickly.

Isn't it true that either a red light (when charging) or a green light (when battery is full) should be lit?

If this is the case, how would I be able to determine whether it is still working properly?