I use 24's. Completely agree with Spare on the Deka batteries. 1000 MCA of brute force is hard to argue with. I got mine from BJ's wholesale club (Like Costco or Sam's Club) They had the best prices around here. Both my v's have them and I've not had any problems, ever, with them. My only exception is on my 12' rowboat that I have an electric trolling motor on. I use an Optima Bluetop deep cycle battery for that one.
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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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