Autel Battery and Electrical System Analysis Tester MaxiBAS BT506 is a battery and electrical system analysis tool that uses as Adaptive Conductance an advanced battery analysis method, to produce a more accurate examination of the battery’s cold cranking ability and reserve capacity, vital to determining a battery’s true health. The BT506 enables technicians to view the health status of the vehicle's battery and electrical system. Support for MaxiSys Ultra, Elite II Pro, MS908S PRO, MK808Z-BT.