Originally Posted by perrybass
Just saying, I learned the hard way that deep a cycle battery is just what it says. it can only be drained fully so many times before it is truly "dead". Regardless of age, once she's dead she's dead. What's most important is management of your $500 investment.
Deep cycles can go down to 70% discharged 100's of times if not left there. Keeping them above 50% and fully charging after reaching there has given many 10 years of use, I have 8 so far.
After putting a new starting battery in my truck last year, I developed a large phantom drain. After 2-3 days of sitting, it was dead. I did my best to keep on top of it, but after the 6th drain down, the battery was shot. Thats the reason you don't use starting batteries in your coach.
To me, watering systems are a waste of money, with a good 4 stage charger. I've been waiting over a year for the water to get low enough to top off with mineral oil and I'm plugged in 24/7. Now I don't see any use for it. If I can't add water once a year, I don't need a MH