[ubuntu] Battery lifespan degrade

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http://ubuntuforums.org – Dear all, i'm experiencing my laptop battery's lifespan is degraded. (my laptop is IBM T60) i just changed OS from WinXP to Ubuntu 9.10 a couple of weeks ago. Since then my laptop can sustain only less than 30 mins (from approx. 2 hrs with WinXP) Here is the battery detail. Quote: Product: Laptop battery Status: Charging Percentage charge: 73.9% Vendor: SONY Technology: Lithium Ion Serial number: 6215 Model: 42T4569 Capacity: 93.7% (Good) Current charge: 38.9 Wh Last full charge: 52.6 Wh Design charge: 56.2 Wh Another thing, sometime the battery cannot fully charge to 100%. Your help will be grateful. (Hardware)