There is a more authoritative answer for this on the Unofficial Kindle Support Board:
http://www.unofficialkindlesupport.com/index.php
The FAQ thread on this topic is here:
http://www.unofficialkindlesupport.c...c.php?f=3&t=54
Quote:
Aftermarket USB power adapter (either AC or 12V DC, for car use), or one serving some other device.
* Now, please be careful. Not every USB power supply that satisfies Kindle voltage and current requirements is good. For example, the one that came with my iPod Classic does not work. Suitable power adapters will comply to something called Open Mobile Terminal Platform specification.
* According to user reports, suitable supplies include those for recent Blackberries and some other mobile phones using Micro-USB B for power connection, and those from company iGo. There are more, of course.
* How to test:
o Plug the Kindle in. Charging LED should light up, and battery symbol should be pierced by a lightning bolt.
o After 30 seconds unplug it. If either LED or lightinig bolt stays, we have wrong adapter. Reset the Kindle by holding the power slider for 30 seconds.
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So that is a documented way to test your 3rd party adapter. Plus, it does not appear that testing with a standard USB adapter that does not work for the Kindle would actually hurt your Kindle during your testing.
Travis