Amazon.com: iFixit A1398 A1494 Battery for MacBook Pro 15" Retina (Late 2013 /Mid 2014) - Repair Kit : Electronics
How to Replace the Battery in a MacBook Pro Retina 13-inch (late 2012 - early 2013) MacBookPro10,2 - YouTube
Genuine A1494 Battery Ap ple MacBook Pro 15 Inch Retina A1398 Late 2013 Mid 2014 724190487136 | eBay
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 MacBook Pro (15-inch, 2013) review: Apple's high-end laptop gets better battery life and a lower price - CNET
Replacing Battery for Macbook Pro 15" Late 2013 (iFixit Kit) A1494 - YouTube