MinnKota 330 D keeps two group 31s and 1 group 27 going. Just replaced my batterys this summer all were 7 years old....they were still good and am using two of them on other stuff now. When this charger quits working it will be replaced with another MinnKota. I keep charger plugged up 24/7 only time its unplugged is when I am fishing. I have used other brands thru the years but this is the best one I have ever had.

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