I have a charger that came with my phone, Huawei Mate 9. I recently bought another phone, Xiaomi Pocophone X1. I tried to charge the new phone with my charger (and cable) and it went into boot loops and ended up draining the battery instead of charging. I then connected it to the charger that came with it and it charged fine.
What caused this difference? I'm asking since I want to buy a backup charger and want to know what to look for (other than buying a Xiaomi original)