how much is duration expectancy before battery must be recharged for this model? I know it depends of what are you working, but my battery is empty after little more than one hour of usual work (internet browsing, no multimedia). I am on balanced power profile and not on full performance. Nothing working in a background. I even installed SSD. This was the case with the first battery when I bought my device five years ago and today I bought new battery with even more capacity and the short time of usage still remains.