I will try turning it off and see if it makes a difference. The battery certainly runs down very quickly when it is left on. I hadn't been turning it off because I thought that the battery wasn't being used when the screen was just sitting there. Turning the screen off doesn't really shutdown the entire reader so I didn't think that would help much. I actually removed the battery from my Sony once and the screen didn't change. I will certainly try it because I need to do something.
I very much like the time displayed but if it is the cause of the battery drain (pure supposition) then is there a way to turn it off or slow it down or something?