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I'd say the battery life is about the same as that of the O2, but then I don't use the warm light much and I also don't usually read several hours a day. I have no complaints about the battery of my O2 either. Of course the battery goes down way faster for those who read 5, 6, 7 hours a day. I generally read a couple of hours, sometimes 3, very seldom more.
Also quite a lot of people keep their frontlights in the upper half of the scale. Mine is usually at 9.
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