NewerTech® : Batteries : NuPower® Battery for MacBook Pro 15" Retina mid 2012 to early 2013 Models
What is the "real-world" battery life of the "Mid-2012" and "Early 2013" 15-Inch Retina Display MacBook Pro? How does the battery life compare to the "regular" Mid-2012 MacBook Pro and the models
Battery for MacBook Pro 15-Inch Retina Display 2012-2013
MacBook Pro 15" Retina (Mid 2012/Early 2013) Battery – iFixit Store Europe
Amazon.com: Temark A1417 Laptop Battery Compatible with MacBook Pro 15 inch Retina A1398 (Mid 2012 Early 2013), fits for MC975LL/A MC976LL/A ME664LL/A ME665LL/A (8800mAh) : Electronics
MacBook Pro 15" Retina (Mid 2012-Early 2013) Battery - iFixit
Apple Exchanging Some 2012 and Early 2013 MacBook Pros Needing Battery Service With Newer Models [Updated] - MacRumors
Amazon.com: Temark A1417 Laptop Battery Compatible with MacBook Pro 15 inch Retina A1398 (Mid 2012 Early 2013), fits for MC975LL/A MC976LL/A ME664LL/A ME665LL/A (8800mAh) : Electronics
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit