This never got answered, and I've always wondered the same. After making the statement that the AH rating is useless, what should we be looking at to judge the power of a battery? Actually it has been answered more times than I care to remember............lol but just not on this forum I guess. The ratings you need to look at are not there. Plain and simple. I know that is not what you want to hear, but it is in the truth. There is no one rating that is recognized in the industry that really relates to mobile audio. CCA and CA doesn't relate because it takes the voltage down to low in the testing. AH and RC are low amperage pulls, which doesn't relate. There will probably never be a single rating you can look at to determine which battery is the best for mobile audio. So what is there to look for? Performance History, Company History, Battery Make Up, Battery Design, Customer Service, and the company and products track record. Sorry it is not easier, but that unfortunately is just the way it is.