I agree withe previous person on gel cells to a point. If you don't use a
cheap $3.99 trickle charger, but instead get a charger designed for them
than all's good. That said why bother with them when the Optima battery is
out there that needs no special charger on a them and they work in all
positions and even with bullet holes in them.
All deep cycle batteries need a different battery charger on them as they
have higher internal resistances and with simply never fully charge without
a good 20 amps going to them. Again the optima deep cycle battery has lower
resistances than the others and are better for that reason, they charge
Best solution get one of the smart onboard chargers that you find in the
catalogues or online at places like Cabela's or Bass Pro Shops wire your
boat to the charger and batteries plug it in and if using the old wet cell
technology check the batteries every week for water, only use distilled
water in them, and be a happy camper with no worries.
and we can talk about using you vehicle to charge your batteries coming to
and from your outings for little bucks but about two days time.