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Grade 1A means that this battery is both in excellent cosmetic condition (A) and has a full charge capacity of 90% or more of it's original quoted capacity.
This is a used A-Grade battery for the 13" Unibody Macbook. This is an A-grade battery in excellent condition and holding 90% or more of its original capacity. The original capacity was 4166mAh. This product does not go lower than 3749mAh.