Current Draw, Charging batteries

Ohm's law is in here somewhere, but I don't know quite how to apply
it....

I use a deep cycle battery, ~80AH @ 5hr rate.

I would like to tote it along on trips, but it needs to be somewhat
portable, so I am looking to wire up something in the trunk, or back
of my truck, to juice it up when I am driving.

Where I get lost is, if I the battery is basically fully discharged,
how do I know what size wire I need to use, to get it back up to
snuff? Do I need some sort of control ckt?

It would be great if I could just plug it into the cigarette lighter,
but that is fused at 10A, so I am assuming a deeply discharged battery
of that size, would pop the fuse. Right? Same thing for a 14Awg set of
connections, they would overload on a dead battery?

Don't really want to run 8Awg wire to the bed, or the trunk, so how do
I figure out what the max current is, that a "dead" battery of this
type, will draw, so I can keep it simple?

I know there are other issues, like safety, starting the vehicle
first, and then connecting the battery, and such, but the basic
charging issue is where I would like to get some advice, please.

Thanks a lot,

John

.

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