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is there a way I can know how much time the laptop is up on battery , i know there is the uptime -but it Tell how long the system has been running both on AC and battery

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Power Statistics 

is what you are looking for. Select 'Laptop battery' and go to 'history' select 'Time to empty on the 'Graph type' dropdown, you can also find a lot of other useful info in power statistics.

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