boriz--Could the audio player on your 505 been accidently turned on? This will drain the power quickly.
(It doesn't sound like it, though because I would think fully shutting down the unit would also shut down the audio player.)
If it's not the audio player, there is definitely something wrong with your unit. The unit does use a minimum amount of power to remember it's settings, but you should be able to get a couple of weeks at a minimum out of a full charge.
Hope you get some good answers-
dordale
