I just bought my macbook pro and it's charged up to 100% and is still plugged in but now shows the battery at 98%.  How is this possible when it's plugged in to the charger and the green light is on?

I just bought my macbook pro and it's charged up to 100% and is still plugged in but now shows the battery at 98%.  How is this possible when it's plugged in to the charger and the green light is on?

The system regularly lets the battery drop to about 95% when on the charger, then recharges to 100%.  This lets the batery exercise "just a little" all of the time and saves the recharge curcuits from overuse.
Regualr occurence for me.
Also ... you need to let your battery work at least once per month.  Let it run down to 40%, but not less if you can at all avoid it.  Running thr battery fully dead will shorten the battery life significantly.

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