iFixit: New MacBook Pro has first 'DIY-friendly' battery replacement design since 2012 - 9to5Mac
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
MacBook Pro (Retina, Mid 2012) Battery Replacement - YouTube
Amazon.com: Ftenlyen A1322 A1278 Battery Replacement - A1322 Battery for MacBook Pro 13 inch Mid 2012 2010 2009 Early 2011 Late 2011 Version High-Performance and Long Lasting [ 10.95V 63.5WH ] : Electronics
How to replace the battery in Apple MacBook Pro 15-inch A1417 for model A1398 (Mid 2012) - YouTube