I have an ordinary, inexpensive Wal-Mart car battery that I use for portible operations. I can run my TS-570 for days on that thing and then charge it up with jumper cables if I need to.
The battery is very clean as it has never been installed in anything. It's only drawback is it's rather heavy, but so are other things we take RV'ing. I'll probably figure out a way to mount it in the 5th wheel, out of the way, and have a totally seperate power system (ie: a battery, a charger, some wire and a fuse) for radio and computer applications. Might come in handy if the converter were to fail.
Just a thought.
Radio
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