MacBook shuts down randomly with still battery charge left. MacBook Pro 15" Retina Display Mid 2012. 22 Answers MacBook Pro 13" Retina Display Early 2015. Parts. Identify your MacBook Pro. Find your battery cycle count. Early 2015) MacBook Pro (Retina, 13-inch, Mid 2014) MacBook Pro (Retina, 13-inch, Late 2013)
BatPower A1331 Replacement Laptop Battery for Apple Late 2009 Mid 2010 MacBook 13.3 inch Unibody A1342 EMC 2350 A1342 EMC 2395 Battery MacBook Pro 13" A1342 Apple A1331 Battery 63.5Wh. Battery Type: Lithium-Ion; Model #: miqpower691791898251; Item #: 9SIBPPKK3Z1806; Return Policy: View Return Policy $

I can confirm that a Macbook Pro Retina 2015 (15") WILL NOT boot correctly without a battery installed. I was rebuilding a system that had damaged batteries. Once I pulled the old battery pack you could show boot disk screen, perform hardware check etc, but cannot boot to OS. You just see the Apple boot screen but will be stuck in a reset loop.

About this item . Capacity: 74.9WH/6600MAH Cell: 6-Cell Voltage: 11.36V Battery type: Li-ion ; Replace Part Number: A1582 ; Compatible Models: New model Macbook pro 13 inch A1582 A1493 Battery for A1502 ( Late 2013, Mid 2014,Early 2015 Version ) ME864 ME865 MF839 MF840 MF841 EMC 2835 2875 MF843 if123-054-5
Early 2015 Battery: Battery Model #: A1582. Watt Hours: 74.9 Wh. Voltage: 11.36 V. Milliamp Hours: 6560 mAh. The difference between them is not that great! Only 3.1 Watt Hours of run time! About 10 to 15 minutes.
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macbook pro 13 2015 battery