I have found that non-usb-host usb chargers will charge the prs-505 if you completely turn the unit off first. It will charge and stay off for 45 minutes. Then turn off fully again and charge again for 45 minutes. You'll get a complete charge in 2 to 3 cycles. I have used AC to usb chargers (cheap one from radio shack), my car stereo which has a usb jack, a cig-lighter dc splitter (auto) that has a usb jack, and the vehicle tattle tale boxes in the vehicles at work.
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