You should be good with any generic USB chargers that give you 5V at 500+mA. You want it to be 5V but the current (500mA) the charger provides can be higher since that just means the charger is capable of providing it. The Kindle will draw as much current as it needs so higher current capacity on the charger is fine and in certain devices, will actually mean the battery charges faster because the device can draw more power during charging.
500mA is what is provided by a computer USB port which is a listed charging method in the Kindle manual. The UK Kindle charger supplies 0.85A aka 850mA for a slightly faster charge.
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