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I'd sincerely go with finding a different wall-wart, as mentioned above, 5V 1A units are very common and you'll be wanting to get one that's listed as a legitimate USB type unit.
Plugging something other than 5V in there could potentially cause issues with the USB circuity in the Kindle, the 0.6V difference is enough that depending on the design of the K3's USB/power circuits things could even end up discharging (but that's me being hyper-paranoid - such is life as an EE).
Paul.
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