Children's ride-on vehicles having charge indicator assemblies that are adapted to provide at least a visual indication of the state of charge of the ride-on's battery assembly. The vehicles are reduced-scale vehicles, often formed substantially from molded plastic, that are sized for use by children...http://www.google.de/patents/US7513324?utm_source=gb-gplus-sharePatent US7513324 - Children's ride-on vehicles having battery charge indicator assemblies
