Apple Exchanging Some 2012 and Early 2013 MacBook Pros Needing Battery Service With Newer Models [Updated] - MacRumors
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Replace your 2009-2012 MacBook Pro HD with an SSD
Amazon.com: A1382 Battery for MacBook Pro 15 inch A1286 Early 2011 Late 2011 Mid 2012 New Replacement Laptop Battery (7200mAh 10.95V/78.84Wh 25 Months Warranty) : Electronics
661-5844) Battery A1382 - MacBook Pro 15″ A1286 (2011-2012)
Replacing the Battery in a MacBook Pro Unibody (2009-2012) in 5 Minutes! - YouTube
Amazon.com: A1322 Battery, A1278 Battery for MacBook Pro 13 inch (Mid 2009, Mid 2010, Early and Late 2011, Mid 2012 Version) 661-5229 661-5557 020-6547-A 020-6765-A : Electronics
661-5557) Battery A1322 - Apple MacBook Pro 13″ (2011-2012)