You may need to try a different USB port. Some USB ports do not supply enough power to charge the Reader, also if the computer you are using goes to sleep or hibernation it will stop charging the Reader and possibly re-drain the battery.
If any of the resetting methods recommended by 'mbelec' do not work, look at getting a used PSP wall charger. If you are in the U.S., they can be purchased for ~$7 at any GameStop. They will revive almost any dead battery when USB charging won't work.
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