Lenovo T500 battery stays on %100 for awhile then drops down to %99 for no reason

Hi,
The Lenovo T500 battery stays on %100 for awhile then drops down to %99 for no reason. What's up with this and how do I fix this issue? My laptop is really confusing me. The green battery says it's totally charged %100 and the little AC adapter icon in the system tray says "%99 available (plugged in, not charging.")
Thanks,
Liz 

Hello Liz,
that is considered to be normal.
It´s bettter for a Li-ion battery not to be charged fully, so the powermanager don´t load the whole time.
That´s why the percentage could drop. But thats not a problem thats a feature.
if your battery handling is set to automatic in powermanager then, eveythings is ok.
Do you use your machine with AC plugged in the whole time?
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