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Xiaomi mobile phone direct charge output voltage is 5V, output current is 1A, as long as the output voltage\/current of the same charger, theoretically can be used normally.
If the output voltage and current of the charger exceeds the original charger, the charging current will increase, the charging time will be shortened, resulting in large heat of the mobile phone, shortening the service life of the mobile phone and the battery, and too high it may burn the mobile phone.
If the output voltage and current of the charger is lower than that of the original charger, the phone may not be able to detect charging, such as low current, which will slow down the charging speed.
If it is necessary for emergency use or troubleshooting, other chargers can be used, but it is best to use the original charger for daily charging.
The Mi 12 can be charged with a 20w charger
In the charging protocol, MI 12 supports :QC4 \/ QC3 \/ QC3.0 \/ QC2.0 \/ PD3.0 \/ PD2.0 fast charging protocol MI FC 2.0 and other fast charging protocols, Mi 12 supports up to 67W wired fast charging, Mi 12 can be backward compatible, so 20w can also be used.
Millet 12 supports a variety of charging protocols, this is the most basic charging specifications, most ordinary mobile phones are supported, of course, millet 12 also supports 20w charger