I have had this laptop running windows 7 for about two years and I have been noticing the battery discharges unconsistenly. Sometimes I am solely surfing the internet through out a whole charge and it does last a good hour and a half more or less.
Other times, right after disconnecting it drops instantly from 100% to 94%. Then just keeps dropping at a fast pace. Yesterday I noticed it was 100% after disconnecting and in less than five minutes I was down to 64% and in a couple of minutes it jumped back up to 96%.
I have tried "Battery Bar" and according to it, on a full charge it marked 2.5 hours and 0 battery wear. Even after unplugging, it would recalibrate itself and start the countdown at 2.5 hours battery time. However, now running unplugged, even with wifi turned off and just using exel, "battery bar" would drop 4-7 minutes of charge time for every minute on the clock.
May this be a faulty configuration or more of a faulty battery?