Battery Leakage? On New Macbook Air 11"

Everything is working beautifully on my new macbook air except for one thing. When plugged into the mains the usage on the battery monitor gradually goes down after about 12-16 hours. When it got down to 98% I decided maybe it needed calibrating with it being new so I let it run down after fully charging, and carry on overnight. Re-charged it up again and the same thing is happening. Down to 99% while plugged in at the mains.
Any advice appreciated

Each computer and battery is unique, even for the same computers. Each battery contains circuitry that controls how the battery is charged, detects what the charge level is, etc. Once the charge level drops to 94% the charging circuitry notifies the charger to turn on. When the battery is fully charged the circuitry tells the charger to stop. Otherwise a battery may be overcharged resulting damage to the battery. However, the connection between the hardware and software sometimes leaves a menubar display showing a battery is 98 or 99% full but never hits 100%. In some cases it hits 100%, but only when the computer is asleep or turned off. I have an older generation MBP that rarely ever shows 100% full. This is not a necessary indication of a battery, charger, or computer problem.
If it bothers you then reinstall OS X in case it'as a software problem, otherwise take it in for service.

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