Battery-'Service recommended', 369 cycles

• Get help with your Mac notebook battery - Apple Support

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

"For more help, learn what to do if your USB-C power adapter isn't charging your Mac notebook. 

If issues persist, shut down your Mac, close the display for 30 seconds, then try to charge again.

Or if you have an Intel-based Mac, reset the SMC."

[There is a pending update to Big Sur (two had same name;

fixed a recent issue) 11.3 should be out of Beta soon. This may

be helpful for several smaller issues; battery too? Check for it.]

• How to update the software on your Mac - Apple Support

https://support.apple.com/en-us/HT201541

• About background updates in macOS - Apple Support

https://support.apple.com/en-us/HT207005

Also be certain to let the Mac run 'mains-grid' power when available

and it automatically can regulate the battery charge while plugged in.

'Battery health' in macOS helps several ways, & prevents overcharge.

Macs since Catalina have that; similar to iOS battery management.

Good luck & happy trails!

🌞🌿⛵️🎣🌻🐢⛄️🌤🌎

Since you made no mention of it, what model

MacBook Air and when did you buy it?

Also, on any laptop these days, batteries aren't just batteries

and typically have multiple sensors in them and likely a chip

to communicate the data from these sensors.

I would take it in and have it checked out anyway. If some

of these reports are anything like OBD reports in cars, the problem

may not be with the battery at all.