I run the everstart 29 series and they have lasted three years,I agree with Dave it has alot to do with your maintenance of your batterys...read and learn to take care of them and they last a lttle better however deep cycle batteries do have a life expectancy and will start to taper off 100% recharges after x number of cycles.
It's funny when people start saying x brand is better than y brand most auto chains and dept.stores have their brand name put on a battery, subcontracted to a battery manufactuer, for example some(but not all) Everstart,Diehard,Optimas,motorcrafts,autozone's are all made by the same manufactuer....Johnson Controls :-)
Good site to learn about batterys....http://www.uuhome.de/william.darden/carfaq4.htm



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