I just received my Inspiron B130 yesterday & this morning while I was using it (with the AC adapter plugged in), I received a message about my battery being at about 8% & I should switch over to AC power.  Huh?  I've searched everywhere to see if I need to do something -- I "assumed" that if I had the AC adapter on it wouldn't be using up the battery.  Could find nothing on this in the users manual.

Any help would be appreciated.