Apple's line of MacBook Pro laptops was intended for the professional and power users. The MacBook Pro line includes the MacBook Pro 13" Unibody, MacBook Pro 15", MacBook Pro 15" Unibody, MacBook Pro 17", and the MacBook Pro 17" Unibody.

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Battery Model A1381 A-stock and B-stock

I am looking at purchasing a replacement battery (Model A1381) for my mid-2010 Macbook Pro. In addition to a new battery, A-stock and B-stock are listed. What is the difference between the A-stock and B-stock batteries.

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How much life they have left in them.

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