The only issue I've had so far is that each battery has it's own charger. I have had 1 go bad and it and the battery were replaced under warrenty. I was told 10 year replacement on the batteries and 3500 charging cycles. On average use, I charge my batteries overnite about once every 2 weeks.
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Mark & Linnae
Birmingham, The U.P., Saginaw, Bay City, Toledo, Columbus, Dayton
& The Village of Chatham 
"I wish I didn't know now, what I didn't know then"
-Bob Seger-
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