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Normally, I would not come to the defense of WalMart, but it is likely they checked your batteries with an electronic tester. In my experience they are not always reliable. A good old fashioned carbon pile tester works best. Electronic testers do not actually place a load on the battery. With a carbon pile tester you can place an actual load on it. I've seen many times when the tester at work would "pass" a battery when I knew in my gut it was bad. Sometimes testing multiple times would reveal it, others not. As for both at the same time, good practice, but not necessary. I was short on cash when mine seemed to crank slow. Checked both with my "old" tester at home. One good and one bad. 15 months later, still running that way. You don't say if they are original. If so, you did well with them.
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