Hi !kurzer Nachtrag zu deiner Frage zuvor.
Dies ist ein Auszug aus der FAQ bei RioVolt :
There is no battery indicator on my RioVolt. Is it defective?
The battery indicator on the RioVolt will appear when there is a battery is running low. We include this feature just to alert you to this condition, not to indicate overall battery life. This does not indicate that you have a defective unit.
Also, the battery indicator will never appear when using AC power.
Gruss
Chris