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by arghwhat 2239 days ago
This is just a matter of usage. MacBook Pro batteries have never lasted me more than ~3 years before signficant degredation (usually marked by swelling, needing replacement to avoid having the touchpad eject from the machine), and that number held from pre-unibody to post-retina. As an anecdote, the later generations seemed to degrade faster than the earlier ones.

Serviceable batteries are very important.