At first I am sorry for my bad English.
I am making robot which can do a lot of things...
If I connect arduino on my robot with PC via USB, the robot works properly. If I use external power supply (9V battery) the robot is doing almost nothing.. The diodes are little bit blinking and sometimes dc motors make motion... And thats all. Batteries are charged. Where's the problem?
Everything I want is make into motion dc motors.. With 5V USB it works. With external power supply not (9V battery).