I didn't have the O2 for very long (1 month before returning it, at the start of the year), but I do distinctly remember thinking the battery life was abysmal. So much, that I decided to return it. I don't find that the case with the O3 at all actually, and the "worse" battery life (compared to my Voyage) does not bother me one bit. And it definitely does take much less time to charge!
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