Just an update on my new one. Unless it goes ugly, it is working great. I am at basically 50% battery life left with almost 3 weeks of use in (19 days). I am not getting as much reading time in as I'd like, but I am probably still averaging a little over an hour a day. I plan on charging it as soon as it dips below 20% charge, which by my estimate puts it somewhere around the end of next week, or a bit over a month on one charge.
After that I'll probably charge it about every week or two. I don't much see the point in intentionally running the battery really low, but it'll be nice not to have to worry about the battery for any realistic usage scenario.