NewerTech 76W NuPower Battery Replacement Kit for 13" MacBook Pro Retina ( 2012 - Early 2013)
Amazon.com: A1398 A1417 Battery, POWERWOO Battery Replacement for MacBook Pro 15 Inch Retina Only for Mid 2012, Early 2013 Version High Capacity 11.26V 99WH/8800mAh : Electronics
iFixit: New MacBook Pro has first 'DIY-friendly' battery replacement design since 2012 - 9to5Mac
MacBook Pro 13" Retina (Late 2012-Early 2013) Battery - iFixit