MacBook Pro 15" Retina (Mid 2012-Early 2013) Battery - iFixit
iFixit posts repair guide for Retina MacBook Pro, estimates battery replacement at $500 - 9to5Mac
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A1437 A1425 Battery For MacBook Pro 13 inch Battery Retina Late 2012 Early 2013 | eBay
MacBook Pro 15" Retina (Mid 2012-Early 2013) Battery - iFixit
Amazon.com: A1417 Laptop Battery Compatible with MacBook Pro 15 inch Retina A1398 Mid 2012 Early 2013 Version MC975LL/A MC976LL/A MD831LL/A ME665LL/A ME664LL/A 020-7469-A 10.95V 95Wh 6-Cell New : Electronics
NewerTech NuPower Battery for 2009-2012 13" NWTBAP13MBU74V B&H