Sorry that I wasn't replying, I was out-of-town and out of touch for several days.
Anyway, my understanding is similar to that of DHill (post 7) that the battery should be recharged in USB drive mode when connected to your PC. The issue with ejecting and leaving it plugged in is that you can't actually read it in USB drive mode. So this means that connected to your PC normally means USB drive and charging while connected, but 'ejected' means it is readable and charging.
Furthermore, I would note that this is my second e-ink device and that even with my previous device I was at the low end of the battery time. As someone mentioned previously, the trick is page turns not time in use. Here are some factors that can affect page turns:
1) Faster reading
2) Font size (as mentioned earlier)
3) Skimming -- when I am re-reading a book, there are times when I will skip through sections. This means a lot of quick page turns without really reading the content when I skip through the boring part. Unfortunately, this drains the battery just as much as if those pages were read.
For whatever reason, I seem to be bad on reading times. Even with wireless off I usually can't go much more than three or four days if I am actively reading; more usually about two days.
I will try the experiment someone suggested of hooking to a desktop computer and/or a USB hub.
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