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Early 2011 Model: A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor

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Need help with MacBook Pro 13 battery.

Hello, I have a early 2011 MacBook Pro 13 unibody model no:A1278. I need to buy a new battery and was wondering if a 2009 MacBook Pro 13 battery will fit inside my early 2011 MacBook Pro unibody. They have the same model numbers but different manufacture dates. So will the 2009 MacBook Pro 13 battery fit inside my early 2011 MacBook Pro?

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This question was migrated from http://meta.ifixit.com/Answers.

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There are models of the battery that are compatible with both years.

The battery we sell is one of those: MacBook Pro 13" Unibody (Mid 2009/Mid 2010/Early 2011/Late 2011/Mid 2012) Battery

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