It's not really normal as far as batteries go, but in my experience they all do this after 3 years or so. I'm not sure about the retina models, but this was common with the old ones. I know it's an old one due to the price quote. It suggests a 2012 13" model. You can always try complaining through Applecare or executive relations as others have done, but the store itself won't help you.
7/9/15 at 10:19am