Which battery charger did you get? Is it an intelligent three-stage charger? If not, it will probably likely fry your batteries...
Most portable battery chargers aren't recommended for use on a boat as they can be a fire hazard. The alligator clips can come loose unexpectedly, and that can be bad. Also, it requires you to open the battery box to have the clips attach to the battery posts, and if you leave the battery box open and something falls across the posts...bad things can happen.
If you want to charge the batteries on the boat, you're much better off hardwiring in a proper marine battery charger into the system.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.