I think I just started noticing this problem when the latest beta (21) came out. 1. I always put the sleep timer on 5 minutes, and do so with every new beta install and/or each time I replace my rechargeable batteries. 2. I installed the beta, read some, and put the unit to sleep and locked overnight. 3. Next evening, I found that the batteries were drained. So, I installed a freshly charged set of batteries. 4. Again, I read for a few hours, turned the unit off, locked it, and went to sleep. 5. As before, the next evening I picked up the Bookport to read and, again, the batteries were dead. So, I put in a freshly charged set of batteries again and all was well. 6. I haven't checked this evening yet, but at least the Bookport beeped when in locked mode when I hit any key (as it should) this morning before I left for work. 7. I've seen some folks on this list indicating that they don't think that the sleep timer works properly. I would believe this, but have not tested it quantitatively. As I indicated, I always have the sleep timer set to 5 minutes. Most times when I'm reading it seems like this works fine. I would almost swear that I've been reading for much more than 5 minutes on some occasions until the Bookport puts itself to sleep again. As I said, this is just an impression, but it seems to happen quite often. I haven't been very bothered by it, so I haven't actually timed the sleep timer. Maybe that's something I should do! Anyway, I hope this is helpful and that the battery drainage problem can be fixed very soon. Fortunately, I always use rechargeable NiCad batteries. They usually work quite fine and last a long time. Of course the battery indicator works a bit strangely, but once you have that calibrated its no problem. For example, I know that the fully charged batteries start at only 75-80% and drain down to 60% or so quite quickly. Then, however, it takes quite a while to go f from 60% down to a about 40%, and once I'm in the 30's, I know the batteries won't last much longer. -- Pete Dr. Peter A. Torpey Research Fellow XEROX CORPORATION 800 Phillips Road, Mail-Stop 38-D Webster, New York 14580 Phone: (585)-422-0470 e-mail: ptorpey@xxxxxxxxxxxxx