Well, if your boat is big enough, electric power has been proven to be a good source of propulsion. Just look at WWII submarines, made by the Electric Boat Corporation. And of course in the present day, pod drives on boats (electric motors getting their power from an on-board engine) are becoming almost everyday occurrences. But if you're talking about running a boat like ours, all day, on batteries, I don't think that battery technology is anywhere near being able to accomplish that. You would still need a tremendous amount of space on-board, and all that extra weight will effect the performance significantly. Still, it's a nice dream.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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