Not exactly RV related, but I figured I might get some help here. I need to replace one of the batteries in my Lund fishing boat. I bought a Interstate Deep Cycle Pro 27 3 years ago and it is dead...
Check wikipedia for AGM battery . That is a superior design over conventional lead acid design . The cheapest AGM battery I could find was an Exide EDGE AGM battery . I paid $ 140 each for a couple of EDGE AGM batteries at BiMart . The sizes are limited but Exide EDGE AGM has a dual post AGM marine / RV battery plus group 78 which fits duramax with the side bolt post hookup . EXIDE EDGE has a 4 year 100 % replacement guarantee .