When I was investigating equipment for preparing my landrover for
overlanding it was accepted that the combination of optima yellow and
red batteries with a solar panel,
here is a company that specialises in such equipment but I am sure you
can find a setup in the USA for less.
http://www.ibs-dual-battery.ch/
plug in a Walkman etc. anywhere. Don't forget a solar panel. The
technology is getting pretty good. A lot of boaters are using them. The
most expensive part is the electronics to keep from cooking the battery.
If a person is careful no expensive electronics are needed.
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