55ah would be way overkill . i probably could have gotten by with just 6 11ah cells but wanted to have plenty of reserve power so went with 12 . the 55ah ones used for the gem cars would weigh 24lbs and are about 12" x 11" so a tough fit in crossfire and no real advantage .

we built a 12 cell 11ah one and put it in a diesel tractor . diesel need a lot of power to start and it had no problems. i'm going to do a 6 cell for the waverunner , 12 cells for the muscle cars and 55ah for the boat ( boat needs lots of ah's for all the electronics , pumps , etc.)

here is a video from a guy who has bought multiple sets from us 11ah and 55ah

this is just 6 cells