Battery capacity

JHmosse wrote:

I got a message on my MacBook Pro that said my battery's capacity is significantly reduced. To restore capacity, please check your service options. What can I do about this?

You do not say what exact Mac(?)

What exact macOS (?)

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

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

About Mac notebook batteries

https://support.apple.com/en-us/HT204054

Batteries - Maximizing Performance - Apple

https://www.apple.com/batteries/maximizing-performance/

About lithium-ion batteries

https://www.apple.com/batteries/why-lithium-ion/

Determine battery cycle count for Mac notebooks

https://support.apple.com/en-us/HT201585


About battery health management in Mac notebooks https://support.apple.com/en-us/HT211094

JHmosse wrote:

I got a message on my MacBook Pro that said my battery's capacity is significantly reduced. To restore capacity, please check your service options. What can I do about this?

So what happens when you click the Service Options?

Get help with your Mac notebook battery

https://support.apple.com/en-us/HT204054

Hold the option key and click the battery icon in the menu bar. If it’s Condition: Service Battery, then have it replaced by Apple.

Mac Repair - Official Apple Support