Macbook Air's battery drains when turned off

Hello Dettus,

Thanks for using Apple Support Communities. This might be due to your MacBook Air battery's condition. You can see if it is functioning normally or if service might be recommended using the following guidance from Check the condition of your Mac laptop’s battery - Apple Support.

"To view your battery’s condition, choose Apple menu  > System Settings, then click Battery in the sidebar. (You may need to scroll down.)

Look at Battery Health on the right. You may see any of the following conditions:

• Normal: The battery is functioning normally.
• Service recommended: The battery is performing normally, but its ability to hold a charge is less than when it was new. You may want to consider replacing the battery.
• Note: The battery may also not be functioning normally, and you may or may not notice a change in its behavior or the amount of charge it holds. Contact Apple or an Apple Authorized Service Provider for service. Repairs performed by untrained individuals or using non-genuine Apple parts may affect the safety and functionality of the device. See Find out how to service or repair your Mac. You can continue to use your battery before it’s checked without harming your computer."

Kind regards.