The reason why the Xiaomi fast charger is not applicable to Huawei is that the Huawei mobile phone fast charger and the Xiaomi mobile phone fast charger are not fully compatible, that is, they can not be completely used normally on another mobile phone, you can just charge ordinary but fast charging is not universal.
Because different chargers meet different charging protocols, the phone uses a non-standard charger, which cannot guarantee the match between the charger and the phone, and there may be limitations when charging.
It is generally a matter of agreement, after all, Xiaomi's fast charge is not the same as Huawei's, and Xiaomi's 20000 mah charging treasure is a 50W super flash charge, which should be matched with a fast charging wire to achieve the effect of flash charge. You can consult the customer service of Xiaomi or Huawei to see the fast charge agreement supported by Huawei mobile phones, or the agreement of Xiaomi's fast charge bank on your hand.