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5.0 or 5.2 is not much difference for charging time.
Most of power supply is based on no load voltage.
When you plug it into devices, It will frop to some valuw and coul depend on internal charger design.
Make sure it can supply enough current for specification,
If you have AC-to-USB adapter and can find USB-to-DC jack for SONY, It is the best for simultaneouly charging and readinf, because plugging to USB will cause the PRS505 to charging mode only.
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