Amazon.com: iFixit A1398 A1494 Battery for MacBook Pro 15" Retina (Late 2013/Mid 2014) - Repair Kit : Electronics
Amazon.com: A1502 Replacement Laptop Battery for MacBook Pro Retina 13 Inch Late 2013 Mid 2014 Early 2015; MacBook Pro A1493 A1582 Battery EMC 2678 2875 2835 ME864 ME865 : Electronics
How I replaced the swollen battery of my MacBook Pro 15″ Retina Display (mid 2014 model)
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SLODA Replacement Battery Suitable for Apple Macbook Pro 15 Retina A1494 (A1398, Late 2013 and Mid 2014) Laptop Battery [Lithium Polymer, 8800mAh - Newegg.com
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Amazon.com: iFixit A1398 A1494 Battery for MacBook Pro 15" Retina (Late 2013/Mid 2014) - Repair Kit : Electronics
MacBook Pro 15" Retina Top Case w/ Battery (Late 2013 - Mid 2014) - 661-8311