First 2 bank charger lasted just over 2 years, then fried one battery, case cracked. M-K gladly replaced unit even though it was one month out of warranty. Second unit lasted just under 2 years and one bank did not charge. M-K replaced unit but advised me that this was the last warranty claim. That was just over a year ago. This weekend I found both troll motor batteries dry. One gallon water each, then would not hold charge. Replaced both batteries, installed fully charged. M-K charger pumped these batteries for hours. No fully charged indicator. Charger was hot, would not taper charge. So first unit fried one battery, this one fried two. DO NOT BUY IT.
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