Just installed battery #3 in my mid-2015 MacBook Pro. Also applied fresh thermal paste and removed the dust. Here's to many more years of use! : r/ macbookpro
NinjaBatt Battery Replacement A1618 A1398 for Apple MacBook Pro Retina 15" [Mid 2015 Year ONLY]- Long Lasting [11.36V/99.5Wh] - Newegg.com
Purchase a MacBook Pro 15-inch (Mid 2015) Replacement Battery
A1618 Battery for MacBook Pro 15" Retina A1398 (Mid 2015)
How to Upgrade / Replace the Battery in a MacBook Pro Retina 15-inch (late 2013 to mid 2015) on Vimeo