I'm looking to find a way of charging multiple flipcams, whilst being locked away in a secure unit. However, I simply cannot get the unit to charge at all, when connected via a USB cable, to a USB power socket plug. The battery symbol is displayed, but no 'lightning bolt' appears to indicate the unit is charging. Plugging the unit directly into a PC yields successful results. Surely a USB wall socket plug is providing the amount of required power to charge the unit?!