Huawei's 66 watts and Xiaomi's 67 watts are universal. The phone should be charged as it is used, rather than charging it every time it is prompted with a 20% low battery. In this era, the internal use of mobile phones are mainly lithium batteries, the general charging life of lithium batteries is about 200 times after charging the residual power is about 80% of the original, such operation is more correct.
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With the same voltage and current and the same USB interface, various brands of chargers and mobile phones can be common. Huawei charger is more durable, Xiaomi charger is easy to burn out.
If the agreement is the same, Huawei's fast charge is 9V2A, 4.5V5A and the latest 40W, and it must be the same voltage and current.
Huawei 66w fast charge and Xiaomi 67W can be mixed.
Because, the two powers are about the same, basically the same. 67W fast charge can charge 66W, 67w can charge electrical appliances within 67w, fast charge is not the higher the power the better the experience, the faster the charging speed. This includes battery design, circuit design, chip design and other tripartite collaboration, in order to have a better fast charge experience.