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3 amp charger?

I agree, your phone's charging circuitry will only be pulling in what it needs. It's not a matter of what's available will be pushed into your phone and fry the battery. When it comes to USB charging, more is better so with 3A you should be seeing shorter charging time than with a 2A charger. Get a good, higher quality USB cable too, all those too-common, budget, thinner-gauge cables are just not as capable.
 
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