Need some battery advice!

OldSmokey wrote:

Powerstroke2000 wrote:
I'm currently having had an issue with my Interstate 12V (dual) batteries in my Arctic Fox camper, in that after 3 days of boon docking, my fridge stopped working, thus realizing I must be below 6 volts of power (was told the fridge needs 6V to run while on propane). After the 3 days we where back on the road, so the truck charged the batteries to the point where the fridge would run fine, and after that we stopped where we would have shore power for the few nights prior to heading home.

I did pull my batteries and put them in my garage on a piece of carpet and my 4 stage charger started out showing 25% power in the battery, and within a half hour it was up to 100%. I'm unsure if this is a true 100%, or if the charger has been fooled in some way, as it didn't take long to get to where it should have been. I say this, as I put this same charger on my wife's car, where she was having no battery issue, but when I put it on it showed her battery at 50% and it took overnight and into the late morning before 100% showed. My charger breaks down the sulfation process, but whether the battery is at a true 100% I don't know on this camper battery. I have another 12V interstate (currently in the camper which I'll change out with the charged one) and see how long that one takes as well. I think these batteries are about 5+ years old, but we're thinking of perhaps going to a motorhome, so I don't know if it's worth spending the $$ to change them out, or if a full charge and maintenance through the winter (if it didn't sell) is worth it?

the clue here is "within a half hour it was up to 100%"
your batteries are sulphated and now boat anchors.
buy two 6 volt batteries of the desired capacity.
don't parallel FLA's

I don't believe the battery area will allow 6V batteries, as they are a fair bit higher than my current 12volts, or I would! There is a battery sliding tray the batteries sit on, and a total of 8" maximum unfortunately.