Of course you can. 65 watts may be backward compatible with other protocols, charging at 30 watts maximum power. Just like the barrel theory, the shortest board.
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65W to the maximum support of 30W mobile phone charging, the input current will choose a 30W within the output, many chargers have 5V-2A,5V-3A, 9V-2A,12V-2.25A, etc., will use the appropriate current, for example, the maximum support of 10W mobile phone, is 5V-2A, You use the version of the 18W charger is 5V-3A, but when charging will only provide the current of 5V-2A, that is, still retain 1A, will not damage the phone at full speed, unless you use no 5V current, the minimum support only 9V-2A, it is not suitable, but there is no charger on the market now only one specification.
A 30-watt fast charge can certainly charge a 65-watt phone,
But his speed is 300,000 speed to help you charge, of course, the charging time may be a little slower, but not much slower,
So in fact, we generally recommend charging the watch while playing on the mobile phone has an impact on the TV. Hope I come back to help.