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I am a retired Mechanic and I have worked on a lot of charging systems over the years, keep your batteries matched, do not mix a group 24 with a group 27 or 29, best to use the same manufacture if possible, I have 6 group 29 deep cycle batteries in my bass boat, 4 of them are for the 24 volt trolling motor, I have 3 solid state chargers, one for the two 12 volt engine batteries and two for the 4 trolling motor batteries, I have 2 groups of 12 volt batteries in series, they are isolated so as I run down one set I switch over to the other set. I had a battery die on the trolling motor and could only find a group 24, that group 24 with the one group 29 would only last a day at best, the other two would go 2 1/2 days, after I got home I swapped out that group 24 for a group 29 and end of problem, I might mention that the solid state chargers for the 24 volt system has 4 connectons, two positive and two negative, the charger only charges 12 volt but it charges each battery separate even though they are hooked in series
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