Battery life

johnksr

I have only had this Aspire 4830gt-6808 laptop for a short time and when I'm using it on the batteries, I get a popup saying  "40min left" then 10 min later it's saying  %7 left plug in. What gives?

I usually use it on batteries because I was told that keepping it plugged in will shorten the life of the battery, and since the battery is internal on this laptop, I can'f remove it when I am running on the adapter.