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by bk 5869 days ago
Some ultra low voltage processor models get around 10hrs of battery life as well. The Asus UL series get really good battery life, at least under Windows.

I have a UL80vt running Ubuntu 9.10 and get around 5hrs on that with the screen at full brightness (b/c brightness control only works with reboot). It also uses the nvidia dedicated graphics afaik (it has hot-switchable dual graphics under windows).