Patent ID: 7567057

Claim:
A vehicle multiple battery system comprising: An accessory battery having an accessory positive output and an accessory negative output; an at least one starter battery having a starter positive output and a starter negative output; a controller coupled to an at least one sensor, the controller sensing the condition of the accessory and starter batteries and switching an at least one switching device to one of an at least two switching positions; wherein the switching device has at least two operating positions, the at least two operating positions selectively engaging said accessory battery and said at least one starter battery such that; in a first operating position of said at least two operating positions the common positive terminal is coupled to the accessory positive output and is further coupled to the at least one starter battery positive output through a one-way charging circuit between and preceding the at least one starter battery such that in the first operating position, the one-way charging circuit permits electrical energy from the electrical system to flow into both the accessory battery and the at least one starter battery, but prevents electrical energy from flowing out of the at least one starter battery and; a second operating position of said at least two operating positions which couples the common positive terminal to the starter positive such that the common positive terminal is coupled at a point beyond the one-way charging circuit to the starter battery positive.