Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
openmic wrote:
"OMG ... Apple Service and Support wants $639.81 to replace the battery on my Macbook pro, 15-inch, mid-2015."

A swollen battery is a safety hazard.
Where in the world are you?

Do you have a "brick n mortar" Apple Store anywhere nearby?
If so, make an appt. at the genius bar and take it to them.

They SHOULD quote you $199 to replace the battery (parts and labor).

Something's not right with the price you were quoted above.
 
Screen Shot 2020-12-29 at 1.01.10 PM.png
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.