As a former owner of a 505 and now have the wonderful 950, I've learned that it is very important to charge your reader with a dedicated wall unit (like the Sony PSP charger) overnight. Using the PC USB for short or extended durations has been shown to lead to all kinds of problems.
Also -- if you use the mp3 player and have additional memory cards that are full -- they can drain your battery. Try to install a hacked software that allows easy full power shut down. This will extend battery life.
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