Battery information not very accurate

I just bought a new 2013 MacBook Air and the "Time Remaining" battery info has not been very accurate. The "Time Remaining" will continually jump around a few hours. It will read something like 13 hours remaining then I'll look again and it will 17 hours. The battery is on its third cycle.
Is this normal?

It adjusts its estimate of remaining run time based on the load on the machine.  As the load fluctuates, the estimate will fluctuate.  It is also normal for a new battery to take a few (partial) cycles for the meter to settle down a bit and give more reliable estimates of capacity and run time.

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    iPhone and iPod touch: Charging the battery
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