Full charge but still shows only 4 hours

I had fully charged the laptop till 100%
I am now running on battery and it shows time remaining only 4 hours
why?

First of all which macbook pro are you using? And secondly the time remaining is based on whatever you currently doing with your computer at that time. For example if you are running a CPU intensive app, have the display brightness at max and browsing the net then the time remaining will be less than what apple says. However, if you dim the display, quit all applications and turn the airport off, you will notice a great improvement in the time remaining.
Steve

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