what is Involved in “Battery Service Recomended

Hi,

You'd better contact Apple Support or making Genius Bar reservation if your local retail Apple Store is open or find opened local Apple Authorized Service Provider to ask for replacing the battery of your MacBook Pro.

Get help with your Mac notebook battery - Apple Support

Official Apple Support

https://www.apple.com/retail/geniusbar/

Apple - Find Locations - Location Selector

Dónal Ó Néill wrote:

what steps do I need to Take to service the Battery on my Intel-based MacBook Pro 15” (2107)

Learn how to get your Mac fixed and how much it will cost.

https://support.apple.com/mac/repair/service

Get your Mac ready for service - Apple Support https://support.apple.com/en-us/HT209095

See HWTech—

”Previously Apple had four different battery conditions which really allowed a user to know the true status of the battery (Normal, Replace Soon, Replace Now, Service Battery),

but now with macOS 10.15+ there is just two conditions (Normal and Service Recommended).

Before the "Replace Soon" and "Replace Now" indicated a healthy battery with diminished capacity with the former meaning capacity was below 80% of original and the latter was at a point where the battery would probably only hold a charge for an hour or so while "Service Battery" meant macOS had detected a hardware issue with the battery. Now "Service Recommended" combines the latter three conditions into one….

which in my personal opinion is overly simplified and just causes even more confusion and wastes many people's money.”

ref:

https://discussions.apple.com/thread/252619091?answerId=254938752022#254938752022

About battery health management in Mac notebooks— introduced with macOS10.15.5

https://support.apple.com/en-us/HT211094