The dealer I work with has alot of these batterys out there, I had a lot of question also do to fishing as much as I do. I know of one who has had hes in his boat sence 2007 and still holding up with no problems. During the BFL in April, I was flipping on Barkley, one bay all day (7) hours no running. with a HDS-8 & HDS-10 live wells full and pumping all day, the motor started the first crank. I was fishing the EverStar Championship last year on Wheeler, flipping docks all day my Deka AMGs gave up on me so I like the Optimas but Im sure other cam say the same about theirs but the weight a lot more, good for going under a bridge but I would rather save the weight.