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I have not been scientific about it, but I'm getting about 6 days on average with my JBL and the NiZn rechargeables. Almost double what I used to get with a Jetbook.
And best of all, when it gives me the low battery warning, I just go swap out the battery's and go back to reading inside 5 min. Instead of having to put it on charge for 4 hours.
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