It's charged. It's a slow 15w
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65w charger can not charge 15w, this is because the rated power of 65w charger is larger than the rated power of 15w battery, the rated power of the two phases does not match, if the 65w charger is used to charge 15w, the high voltage of the 65w charger will burn out the 15w battery, so the 65w charger can not charge the 15w battery. Instead, choose a charger that matches the 15w battery
The 65w fast charge is actually only 15w of power, and that's because your phone only supports a maximum charging efficiency of 15w inside. Even if the 100w fast charger is used to charge it, it can only charge up to 15w of power. So make sure you find a phone that matches.
For example, many OPPO mobile phones, it supports 65w fast charge, the phone supports 65w internally, and its standard is also a 65w fast charge head