Not all batteries are created equal; I recently put a Interstate in 07 K-9,its made for them by someone else I forget who at this moment. Its rated at 315 CCA. I brought home the Midtronics battery tester from work just to see what it really was. It tested at 485 CCA.This battery kicks butt. cranks over like no tomorrow.
Then On my 06-K-9 It has a new battery put in from a powersports dealer, non (BDM) Where I bought bike,was on consignment there.
Its a motobatt. The dealer says top notch battery we dont put cheap ones in here.
So I hooked up the Midtronics tester-its rated at 300 CCA and it tested at 300 CCA.And you can tell the difference it has a slight lag at first spin over.