Posted by CES on 10/21/14 - 9:24 AM
#2
A group 24 starting battery is all you need. The Deep cycle batteries are good for long periods using a trolling motor, etc. A deep cycle isn't needed for starting a 20hp motor.
I'd say a 525 MCA group 24 battery would do you fine.
http://www.exide.com/Media/files/Down...Manual.pdf