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If you take a phone which came with a 900mA wall charger, and plug it into a 2,100mA iPad charger, as an example, will it blow up?
In short, no: You can plug any USB device into any USB cable and into any USB port, and nothing will explode — and in fact, using a more powerful charger should speed up battery charging. We now do this all the time with our mobile devices here at ExtremeTech, and we’ve never had a problem.
However, when that rating shows an amperage that higher than the phone’s rating, nothing is going to go wrong. This is because the device “draws out” the amps from the charger that it needs – the charger will not pump the maximum rated amperage into that phone.
The charging circuit is in the phone, not the charger. The rating for the charger can be 2.1A but the phone is only going to take enough current as allowed by the phone. For a lower rated charger, you get a slower charge. Above 850mA you don't see a benefit. Your wall socket is rated at 15A but your PC draws 7A, its similar with the phone/charger.
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