NewerTech NuPower Battery for MacBook 13", Late NWTBAP13MBU50RS
Replacing the Battery in a MacBook Pro Unibody (2009-2012) in 5 Minutes! - YouTube
Amazon.com: iFixit Battery Compatible with MacBook Pro 13" Unibody (Mid 2009 to Mid 2012) : Electronics
Ereplacements Laptop Battery for Apple MacBook 15" Unibody. (661-4833-ER)
A1322 Original Battery for A1278 Apple MacBook Pro 13 inch 2009 2012, A1322 Battery for Apple MacBook Pro 13 inch A1278 (Mid 2009 – Mid 2012) - WIT Computers
Battery Indicator Board for Macbook Pro 13" A1278 (Mid 2009-Mid 2012)