MacBook Air 11 in. does not hold a charge

I have a brand new MacBook Air 11 inch computer that I got in the fall of 2013.  It does not hold a charge for very long, probably only 2-3 hours before I have to charge it again.  This happens even though I always have my brightness on low.  When I shut down my computer at the end of the night and go to use it the next day, the battery will also be drained.  I do not know why this happens...

1. did you often drain the battery very low?
2. did you often /always have your macbook on charge,......or did you often / always BOTH have your macbook on charge AND in sleep mode?
1 or 2 are harsh on the battery chemistry and therefore its longevity
all batteries are consumables meant to replaced either in their own "due time" or early due to abuse / misuse.

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