I used Interstate Batteries in the past and got 3 years and 8 months out them then tried Duracell from Sam's Club and they are 2 years and 4 months and loosing their charge while in storage. Everything is shut of at my Circuit boxes and the main switch at the door and they still are going down to 12.0-12.2 volts.
I have located a source for the Crown CR220-6 volt batteries and will try them, based on the good report from Earnest. I maintain the water monthly and when stored for the Winter in my VersaTube shelter I run my generator monthly as recommended by Onan,
