The USB seems to take a long time to fully charge. I would get a full 4 bars, but short life, unless I left it on overnight.
I got the iGo tip (A54) for the PRS-505 (same voltage/current specs) and it charges a lot quicker and seems to properly fully charge. Funny thing is, iGo, has a USB charging cord that takes their tips, and that works better than charging from the supplied USB cable. Plus you can still read while charging with the iGo charging.
I alos have an iGo wall wart for travel, and just picked up a alptop/charing all in one unit that plugs into the wall (any votlage), car or the airline socket.
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