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Try googling on something like Li-ion manufacturer's specifications and you'll find at least one major set of information from the people who make the batteries as well as some stuff from a couple of physicists who did orignal research and design on Li-ion and Li-polymer batteries... personally I trust that info a lot more than that scattered from assorted articles scattered elsewhere...
Essentially a properly designed USB port will give 500mA which is available for a device plugged into it, this can be used in its entirety or at lower currents depending on the demand from the device... and the device/battery can also use much more for more rapid charging with the charge rate being reduced (to a near trickle level) once 80% full charge reached... Also the cycle percentage approach is the correct interpretation of charging cycles i.e. two 50% charges = a 30% plus a 70% = a 100% charge = one cycle... If you think differently, fine but I'm the one with Li-ion and Li-polymer devices that still charge fine after five years of regular usage using info from the manufacturers...
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