After a full charge of the main battery (as directed in manual) Wall-E did not do anything but opening his eyes, saying Wall-E. The remote control(with brand new batteries) was unable to direct him to move in any directions. It seems the main battery is old or not able to charge well. This is a brand new unit and just came out of his box for the first time. Any Idea what the problem is or how I can fix it? I appriciate any feedback.