Replacing the Battery in a MacBook Pro Unibody (2009-2012) in 5 Minutes! - YouTube
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Amazon.com: A1417 Battery Only for (Mid 2012 & Early 2013) A1398 MacBook Pro - Replacement Battery for A1398 MacBook Pro 15-inch Retina (Mid 2012, Early 2013 Version) - EMC 2512 or 2673 [11.26V/99Wh] : Electronics
Apple Has Fully Restored Inventory of Mid 2012 and Early 2013 MacBook Pro Batteries - MacRumors
Amazon.com: iFixit A1398 A1417 Battery for MacBook Pro 15" Retina (Mid 2012-Early 2013) - Repair Kit : Electronics
MacBook Pro 13" Retina Display Late 2012 Battery Replacement - iFixit Repair Guide
iFixit: New MacBook Pro has first 'DIY-friendly' battery replacement design since 2012 - 9to5Mac
Amazon.com: Laptop Battery for A1322 A1278 MacBook Pro 13" (Mid 2009, Mid 2010, Early and Late 2011, Mid 2012 Version) Replacement Batteries MB990LL/A MB991ll/A MC374ll/A MC375LL/A MC700ll/A MD101LLA : Electronics
15" MacBook Pro Retina A1398 Full TopCase Keyboard Battery 2012 - 2013 661-6532 | eBay
MacBook Pro Battery Replacements - Macfixit Australia