The Kindle charger is 4.9V 0.85A
My kindle 2 US charged fine with my 5V 1A adapters (solar and house current). Using those same adapters, neither of my Kindle 2 Globals will charge (the light turns orange, but the battery does not charge).
My kindkes have successfully charged with the A97 micro-USB iGo tip (in wall outlet, 12v vehicle accessory outlet, and AAA battery chargers).
So, I think it depends on the adapter.
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