Well I'm hitting my head against a few brick walls. The smaller motor bike ones are about 200-375cca in the under $100 bracket. Prob not enough to crank my high comp lpg pig.

Need approx 450 min. But agm aren't all measured in cca and that's the prob im facing- in ah how Do i work out eh at would work?

Some golf buggy ones in the 26-33ah range are 400-450cca and others not cca rated.

Came accross a 42ah on eBay for $50 but she says no cca rating as not a car batter it's a solar one.
Specs where
 

Nominal Capacity (10 Hour rate) at 1.80V:  42Ah

 20 hour rate (2.33A):                      46.6Ah

For the 12v 42ah battery.
Do they make a difference in agm batteries.

2nd hand guy says the 26-33ah he has are about 450cca from golf buggies.

The motor bike ones only Harley ones seem to go to 430 cca or so but $150.

I'm getting lost. Can't afford $200 for a 600cca but don't want to throw $80 away on a 375cca that won't do, or $50 on a battery thats either 2nd hand or they say isn't a car battery.

Help?