If so how long would it last if it was powering 2 decient sized speakers? I dont know the battery power capacity so could you give an approxemate answer.
I mean running the amplifier without a car at all
Yes but the length of time it would work would depend on the condition and the size of the batteries. A decent car battery fully charged should power the amp for several hours although trial and error is the best way of finding out. Be sure to connect + & - terminal the right way round and have an inline fuse. To lengthen the time of operation connect two car batteries in parrallel (not series if you can remember your school physics lesson) if unsure don't try it as it will provide 24 volt output and could damage your amplifier.
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