It is possible to choose to use Xiaomi's wireless car charger, but when the car charger charges the Samsung mobile phone, it will not achieve the fast charging function, because the Samsung mobile phone system is certified by agreement. That is to say, Samsung's mobile phone must use Samsung's original charger, or a car charging device that supports Samsung's fast charge can achieve fast charge, and if it is not a Samsung certified charging device, it can only achieve slow charge.
It can be used, but if it is used for a long time, it will cause inconsistent power and harm the battery
Yes, wireless charging principles are international standards, so wireless charging is universal