MacBook Air 13" Early 2014 Battery Replacement - iFixit Repair Guide
I just changed the battery on my Mid-2014 Macbook Pro Retina 13'' | The caffeinated engineer
MacBook Pro 13" Retina (Late 2013-Mid 2014) Battery - iFixit
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MacBook Pro (Retina, 13-inch, Mid 2014) - Technical Specifications