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Message: <blockquote data-quote="vasyachkin" data-source="post: 55511" data-attributes="member: 544250">goddyd4me  - lights dim when on musical peaks the amp draws so much power that there develops a considerable voltage across the battery's "internal resistance"  every battery has it, its even listed in battery's specs sometimes.  you can have zero resistance wire but the batter will ALWAYS have it.  putting a second battery in parallel will halve it, and halve the voltage drop across it.no you will not be able to squeeze more long-term power if you keep playing at max volume for hours, but assuming that you only crank it up real high for a few minutes and mostly using battery at this point ( unless you're doing 120 mph on highway, and not parked ) then a second battery should nearly double your peak power.</blockquote>

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