MacBook plugged in: Doesn't damage the battery on its own; heat is the main factor in wear and tear

Using your MacBook while it's plugged in is generally safe, thanks to the built-in battery management software. This software monitors battery condition, charging habits, and fluctuations in power usage, automatically pausing charging if necessary to help preserve the battery's health. By default, this feature is active on Mac laptops running macOS Catalina 10.15.5 or later.

The article emphasizes that heat poses the greatest threat to battery health. Both a hot environment and simultaneous charging can strain the battery. Certain cases or stands may also contribute to overheating. If your MacBook feels hot during use, verify that its fans are not obstructed.

Battery Health Management is enabled by default on compatible Mac laptops. If it's disabled, you can enable it in the Apple menu, under System Preferences, then Battery and Battery Health. To check the battery's status, open System Preferences, select Battery, and then Battery Health. Common readings are Normal or Service Recommended. Apple does not advise replacing the battery until its capacity falls below 80%.

For long-term storage, Apple recommends keeping the MacBook charged to around 50%. Allowing it to remain fully charged for extended periods can reduce its capacity and shorten its lifespan. The MacBook Air operates optimally between 10–35°C. Additionally, thunderstorms and power outages can introduce unusual electrical issues to consider.