Only when you're not going to be using it for six months or more do you need to take precautions.Let the battery drain to about 50%, and then shut her down, unplugged. That's what Apple recommends.
Apple Support said:If you dont plan on using your notebook for more than six months, Apple recommends that you store the battery with a 50% charge. If you store a battery when its fully discharged, it could fall into a deep discharge state, which renders it incapable of holding any charge. Conversely, if you store it fully charged for an extended period of time, the battery may experience some loss of battery capacity, meaning it will have a shorter life. Be sure to store your notebook and battery at the proper temperature.
I'll be out of town for two weeks. Leaving macbook air at home. Need some advice. Should I keep my laptop plugged in and charging while I'm gone? Do I need to shut down completely or just put my laptop to sleep?
Only when you're not going to be using it for six months or more do you need to take precautions.
It doesn't matter. You can sleep or shut down, leave plugged in or not. If it's unplugged and in sleep (hibernation) mode, it should last around 30 days on a battery charge. This should answer most, if not all, of your battery questions:I'll be out of town for two weeks. Leaving macbook air at home. Need some advice. Should I keep my laptop plugged in and charging while I'm gone? Do I need to shut down completely or just put my laptop to sleep?