Car Audio on a Cart - Alternatives to Battery Power?

[DanL]

Originally Posted by Al Skierkiewicz

The type of battery used in cars has a terminal voltage of 13.8 volts when fully charged. It is generally referred to as a 12 volt system simply to delineate it from 6 volt systems used in some cars or 24 volts used in some trucks. Auto accessories are designed for operation up to 15 or 16 volts so that they will not be damaged should the voltage regulator in your car charging system fail and provide a higher voltage.

Ah, alright... many thanks for the explanation and everyone who posted suggestions on power supplies and the like.