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I don't know about the design of the 505, but quite a lot of devices have the charging light controlled by the CPU (daft, I know!). This means that once it is discharged until it gets to a certain level the device will not power up enough to turn on the light.
Also, I've seen *some* USB connections that don't seem to provide power until the device at the other end has asked for this. Which means that if the Sony doesn't have enough power, it won't be able to ask for the USB to charge it... So getting an AC charger may be a good idea....
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