Is my battery really near the point of dead?

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http://askubuntu.com – If my battery is 100% I only have 30mins left. This are my stats: Energy : 17,6Wh Energy when empty : 0,0Wh Energy when full : 19,3Wh Energy design : 48,8Wh Rate: 34,6W Voltage: 11,0V Time to empty 30,5minutes Percentage : 91,4% Capacity : 39,5% My question is : Does the stats above really say that my battery just has 40% of what it should be after it leave the factory? (HowTos)