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If your phone needs to be on a charger for three hours to be fully charged, and the charger draws 2 amps, then how many electrons have to flow?
Yes you can. The charging current will be the lowest of the two current ratings of device and charger. The charger and the phone have complex internal circuitry that enable this behaviour.
But using a weaker charger for your phone will only lengthen charging time. And using a stronger charger than that the phone will accept doesn't affect charging at all and only wastes money.
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