Quote:
Originally Posted by Siggy1000
The standard USB power delivery is 5V at 1A. Usually on your fastcharger you will find the types of voltage and amps it can deliver. Usually the quick charging either increases voltage or amps. But the device first negotiates with the charger, what type of power it should deliver. For example:
You plug your smartphone in and it immediately starts charging with 5V 1A. Then the charging chip on the phone asks, if the charger could provide 9V 2A, because this is what the phone's battery is designed for in this example. If the charger can deliver it, it will change its internal power switchers to the preferred power. If it can't deliver, charging stays at 5V 1A. And also if you attach your reader to the fast charger, it will never ask for more than 5V 1A. Therefore the fast charger should be save to use...
A different point is the quality of the switchers inside the chargers. If they somehow deliver 5.3V, it could damage the battery in the long run...but I think using one charger for all devices is more convenient.
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Thanks for the quick reply. On my phone charger, I see two different values,
Output: 5V-30A, 9V-20A. Guess these are the range of V and A. I am more confused now.