Originally Posted by GeoffR
My Glo battery doesn't last as long as I hoped, I get about 8-9 hours reading time per charge (with WiFi off, light on about half the time), and find myself needing to charge it every second day. It doesn't seem to lose charge while in sleep mode though, just while reading.
If it's using that much while you are reading, you probably won't notice the little bit sleep uses, much less power off mode. IMO you should be aiming for about a month of reading at an hour or so a day, or 8000 to 10000 page turns so yours does seem a little bit excessive.