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I fished with a guy this last week, with a 1 year old battery, that he said was toast this year. He contacted Marcum, who told him they have re-done their batterys, as their last years batterys were not that good. Then they told him they would mail him one, and all he had to do was pick up S&H. that turned out to be $17. What a load of crap. It was purchased at Bass Pro. In my opinion, if Marcum are big enough to admit a problem, thet should treat this as a recall, mail batteries to their dealers , and get them to Marcum owners, LESS th S&H. I then told him my vexilars battery is now 5 years old. This year I did however replace it as it would only last 4-5 hrs.. But shame on you Marcum, there are other flashers out there, and if it happened to me, I would own one of the others. They all seem good, but anyone of them can have problems. It now can only be defined as good, by how the manufacture handles it. From a sales point of view, it is far more important to keep a customer, than get new ones.