If you are running standard flooded batteries practically anything works well.. And for the $$, provided you've got reasonable space for mounting, flooded is all you need.
What I find preferable is installing an onboard charger that's got a maintenance cycle (practically all of them do). Leave the batteries in the boat, then just plug it in for a cycle here and there. Removing them from the boat is just extra work and with an onboard charger you never need to mess around with alligator clips again.
Jon
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