Turned my MacBook Pro 15' 2015 back to brand new for just $240 USD. Upgraded SSD to 2TB. New Apple OEM Battery installed. Thermal paste replaced. Fans including all internals cleaned. : r/macbook
MacBook Pro 15” 2015 battery - Apple Community
Μπαταρία Laptop - Battery for MacBook A1618 for MacBook Pro 15" A1398 Retina (2015 Version), Fit 020-00079 020-00081 MJLQ2LL/A MJLT2LL/A OEM Υψηλής ποιότητας (Κωδ.-1-BAT0095)
Amazon.com: iFixit Compatible with Battery MacBook Pro 15" Retina (Mid 2015) : Electronics
Genuine Original (OEM) Apple MacBook Pro 15" Retina A1398 Mid 2015 Battery A1618 714757750766 | eBay