Exactly which year MBA is this?
Find that info by clicking the Apple menu () at the top-left of your screen and then select About This Mac. (Note- for privacy and security reasons, please never post your serial number.)
Here is Apple's guidance on the subject.
Batteries - Maximizing Performance - Apple Support
About battery health management in Mac laptops - Apple Support
If battery charging is paused or on hold on your Mac - Apple Support
Are you seeing any other signs of abnormal battery wear or swelling such as the laptop not sitting flush on a flat surface or keyboard misbehaving? If so, then you'll need to consider a battery replacement.
Get your Mac repaired and see how much will it cost: Mac Repair & Service - Apple Support
You can make a Genius Bar appointment for hardware/software service and support using this link: Contact Apple Support - Apple Support
Call Customer Support (800) MY–APPLE (800–692–7753) or on line /getsupport.apple.com/
or call AppleCare Support at 1-800-APLCARE (800-275-2273)