I don't believe there is a way to determine that. I would say if battery doesn't hold a charge for at least 8-10 hours, then its probably pretty old. But, it also depends on numerous other factors, like, how many radios turned on, apps running in background like Facebook, and screen timeout.
Thanks for the reply.
I'm looking at various patterns for serial numbers on the batteries and can't tell anything thus far. I found an S4 thread that mentioned defective batteries and related the serial to the date range but can't seem to link it to S3 battery S/Ns.
Our batteries all seem to begin with:
AA1xxxxxS/2-B where the x's are the characters that vary.
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