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Message: <blockquote data-quote="FuzzyGrub" data-source="post: 518320" data-attributes="member: 3438">You need a charger that can handle the type of deep cycle battery that you plan to buy.  Flooded Lead-acid, AGM, or LiFePO4.Assuming a lead-acid (flooded), group 27 battery would be plenty for fishing, but might want a little bigger if used for locomotion.  I have had good luck with walmart batteries if they are maintained well.  The group 29DC might be worth considering.A LiFePO4 battery and charger might also be worth considering.  More than a LA, but will last much longer.  It will be half the weight of a LA battery.  I recently purchased two TimeUSB 100aH for our 24V trolling motor.I would recommend a 10A charger, such that it will fully charge the battery overnight.  A 5A one will work, if you are not planning to go out the next AM.I have been using Noco chargers in recent years.  They support all three battery types and have a maint mode to desulfate LA batteries.  You can get them in marine, which have detachable ring connectors or ones with clamps, ie portable chargers.  The clamps are detachable, as well, so you can add a ring termnal too.  Both are fully encapsolated and waterproof.</blockquote>