Battery and Trackpad. Disassembling MacBook Pro 15" Retina 2012-2015 (2012, 2013, 2014, 2015) - iFixit Repair Guide
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Amazon.com: iFixit A1398 A1618 Battery for MacBook Pro 15" Retina (Mid 2015) - Fix Kit : Electronics
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Amazon.com: iFixit Compatible with Battery MacBook Pro 13" Retina (Function Keys, Late 2016/2017) : Electronics
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Retina MacBook Teardown Reveals iPad-Like Battery Connector, Details Force Touch Trackpad - MacRumors
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