Why does my macbook have battery problems?

I read that my macbook air is supposed to have 12 hours of battery but after about 2-3 hours I need to re-charge it. When I charge my macbook the charger heats up, I have both problems with all my apple devices and they are brand new (ipad, mac and ipod). Why do I have these problems?
thanks for the answers

Do you have the newest Mac Air notebook, the Mid 2013 model? Only those have a Rated, Guestimate, battery run time of 12 to 13 hours. Older Air models do not.

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