Hi guys. Just an update and some questions. The battery meter shows now 59%, but in the last three days I used it quite a lot. But that's not the point. I encountered two problems.
I have a 4 GB microSDHC and I sideloaded around 200 books. It worked fine but sometimes it got laggy and, in my opinion, there weren't so many books. I would have understood being laggy at 1500 - 2000 books but at 200, no. The other one is that, sometimes, if I put it to sleep while being in the book, when I wake it up afterwards it shows me one the Home Screen "on page 1 of 1". I searched the web and the solution is to delete the book and load it again which is kind of a hassle.
Anyway. I think I'm going for at least 2 weeks with this first charge and I hope with the next one, at least a month.