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WRT the long charging, most people have their computers go into Sleep or turn them off. This can shut power off to the USB ports, causing the port to actually drain the battery. Not sure if the Sony hardware is smart enough to stop the discharge at a safe level, so this COULD kill the battery.
And BTW, ANY memory card will drain the battery faster than using the main memory. So unless you need more than 500 books or for MP3s, don't use a memory card. Or take it out when you don't need it.
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