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While I eventually want to upgrade to Lithium Ion, I am short on time and taking off on a 6-wk trip in a few days; was worried about getting into a big project that I couldn't finish. I did want to upgrade battery power, however, to be better self contained. This is my $400 solution, and I'll do Lion next year.
(2) 6V 250Ah batteries - I think I saw somebody say that the stock 12V batteries are ~80Ah, so this should be a 3X improvement. These batteries are 1.25" taller than stock, so required some modification. I removed the step (1" thick), and had to cut out a bit of the sheet metal. I plan on building a .75" border with a 5/8" plywood step, and dropping the rubber from the original step on top - I think it will end up at roughly the same height and look.
The batteries I bought from Batteries Plus are: 250Ah 6V flooded 11.75x7x11.5" 73lbs Duracell Ultra SLI6V225S $200
Here are before/after pics
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