Anywhere between 2.5 hours (ECO mode off) to nearly 8 hours (Turbo-Battery ECO mode with lowest screen brightness).
In "Office" ECO mode and not much web access, it can manage nearly 7 hours.
In the same mode but heavy web use, it was running for over 5 hours with battery charge to spare for another hour plus.
In Theater ECO mode, battery life is 4.5 hours.
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Kinda ironic that this bigger and more powerful U210x netbook can have a longer battery life than my smaller U100+ with the same battery size (9-cell).





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