Will the battery of my MacBook air get damaged if I keep it plugged in for long hours?

You should exercise the battery, so it can be able to hold as much power

as intended, over the expected life of the battery; and avoid letting the

computer battery run totally flat because that may cause the battery to

no longer hold as deep of a charge, thereby shortening its lifespan.

• About Mac notebook batteries - Apple Support

• How to store Apple notebook computers and their batteries - Apple Support

•Batteries - Maximizing Performance - Apple:

http://www.apple.com/batteries/maximizing-performance/#macbooktips

• Use 'Activity Monitor' on your Mac - Apple Support

• Apps can affect Mac performance, battery runtime, temperature, and fan activity - Apple Support

• Apple Portables: Troubleshooting MagSafe adapters - Apple Support

There are automatic regulation circuits inside the MacBook/Air & other

model portable Apple computers to help not overcharge batteries. The

battery life depends on other factors outlined in the Support links above.

Good luck & happy computing! 🙂

There's no danger in keeping your computer plugged in all day. The system fast charges the battery until it reaches about 95% charged and then trickle charges it until it reaches 100%. At that point if you keep the computer plugged it the charging will stop and the battery will discharge to not quite 95% and will begin trickle charging again. To keep your battery healthy Apple recommends that once or twice a month you take it off the charger and use the battery for the day.

I have a 2011 MBA which tended to be kept plugged in most of the time. I set a repeating reminder for the fourth Friday of the month and that weekend I'd use it on battery, recharging it overnight and using it on battery during the day. For a bit more than 4 years I got great battery life and then it began dropping off. I replaced the battery this July.