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I've used a different brand in the past and you should be okay as long as you have a tip that is compatible with the power plug. A sony reader will not charge from a general usb mini plug type charger. It will only do this from a laptop since it needs the actual driver installed to work correctly. I have seen some cables that go from a usb connection to the power plug advertised, but I haven't tried any of them.
In regards to the battery, I don't think you should have an issue with it being damaged from heat/sun.
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