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I think the important point here is to buy a decently regulated(think somewhere between 30-50% of the price range minimum -check the cheapies carefully. If you don't know how, avoid them.) 5 volt micro USB charger, you'll be fine as long as it meets the minimum current requirements. Having a larger current rating is not a problem as the internal charging circuit in the device will regulate how much current is drawn. Being able to supply more current is not a negative, it is at worst a bit of over engineering, a thing that will never cause you grief unless carried to extreme.
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