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Apple's line of laptops for professional and power users. To date, the MacBook Pro line includes 13, 14, 15, 16, and 17-inch variants, with major revisions defined by Pre-unibody(Original), unibody, Retina display, Touch Bar, and SOC (system-on-a-chip) designs.

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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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