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Apple replaced our macbooks battery a few months ago because it had worn to 75% in 700 wear cycles, rather than their 80% in 1000 spec. In just a few weeks and dozen cycles on the new one, it dropped to 90% from 100, then 85% recently in under 200, in just months. I wonder if they'd replace it again? I think the Applecare was just about to run out during the first replacement.