I knew there was something seriously wrong with the Letto! I've just had to charge my new Cybook Odyssey for the first time. The manual says the Cybook lasts for about a month on a single charge (actually slightly less). I expected something like three or three and a half weeks at best. Guess what? Mine has gone seven weeks on a single charge. As you must have guessed by now, I'm really pleased with my new ereader.  As far as battery time is concerned it's the same as the Kindle Touch (or Kindle Keyboard). It's official: I can definitely recommend this device to anyone looking for an ereader that handles epub books. The only thing I'm not that happy with is that it takes ages to fully charge. It says 3-5 hours on the site and it took 5 hours for mine.