WOT amps is critical if you go off in any direction and there is only the launch ramp to pull it out to the trailer. 1 mile into baby white caps with a rocky shore line ?
NOOA weather report BEFORE you go out. I have ROWED a 16' X 50" aluminum into small whitecaps for a mile. Found out my heart was not so good. 0
Do a calculation of worst case you may face. Then modify battery to what you can spend. Call a couple of trolling motor companies with distance& wind condition you want to make it back to the ramp. I have beached boats on protected sandy or grass beaches & waited out the wind.