i think the problem is because ur laptop's processor and graphics card step down their speed 2 save power...that may b the reason 4 jerky video...i havent tried playin a movie on the battery yet...mine is a desktop replacement so i dont care much abt the battery life..... my power saving setting slows down my graphics card and dims my display 2 conserve battery life...i went 2 the dell website and saw that they dont have inspiron 9100 laptops anymore....dunno if they still have em in India....they do have a new 9200 based on a centrino...check it out...go 4 a centrino if u want good battery life....
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