autozone, and o'riely's both have never accurately diagnosed a battery for me, in the 14 years i've had my license, ive had battery issues here and there, usually from a dead cell or something in the battery under the hood,
Every time they have tested my battery they says its fine, when it turns out, the battery is bad, and the problem I was having goes away when i replace it.
That's why I don't take my batteries or alternators to parts stores because they can't test them properly