Originally posted by 74Argosy24MH
Why not 12v in parallel? There are sizes that will fit your existing openings with great life expectancy and power storage capacity.
If you go to the Trojan battery site, and compare the specs of the 6V T-105 with the 12V
27TMH, you'll find that this 12V
battery that fits in the compartments actually is larger (has about 30 cubic inches more volume) than the T-105, is only about 3 lbs lighter, and in a parallel pair, will provide slightly more amp-hours than two T-105 in series.
IMHO, doing all the mods to use T-105s instead of these is like trying to pound a square peg into a round hole. The smaller footprint of the T-105, which makes them taller, makes sense if you're trying to mount them out on the tongue, where horizontal space is limited and the additional height doesn't matter. But when you can get more capacity without all the work, that's the way I'd go.