My ibook battery slowly drains even when plugged in to power adapter

i just got my ibook G4 14 " screen and each day i have had it the battery has read lower and lower. it usually goes down one percent a day. is it normal for batteries to slowly drain like this even when the computer is plugged in?

The battery is designed to let a little juice out so it isnt 100% all the time. Usually stays at 99% though.
If you see it going into the mid-low 90's then i think theres something wrong.
Also i notice if you unplug it for a few minutes and drain it a few percent, it wont fill it up again untill it goes below 95% or so.
Hope this helps

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