It's pretty normal, 6-cells of ~50Wh capacity usually only power 14-15" laptops for about 3 hours. If you got something more power hungry like a faster video card or a less efficient CPU (Celeron M, mobile Athlons) than 2.5 hours is normal
Yes that sounds about right for that kind of system. Remember that Celeron M does not offer SpeedStep capabilities so it runs full speed at all times and does not clock down to save on power.
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