5V/500mA is USB 'standard' I think.
Is it really? My iphone charger got 5V 1A written on it.
PC USB is 5V/500mA. Smartphones will draw more if they're doing stuff so the charger will struggle to keep up if you're also say, running the GPS chip on it. IFads and other tablets often require 2A.
https://discussions.apple.com/docs/DOC-3511
@scottparsley started
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5V/500mA is USB 'standard' I think.