Also, in addition to what najodleglejszy said, fast charging doesn't always kick in immediately.
There are many factors which are important.
Are you trying to charge from 90-100%? Then for sure it will charge very slowly to save battery life.
Charging from 0-10% instead should go much faster.
Also have a look at your charger. Is it the UCH12W or the UCH20C?
It seems that the device is bundled with different chargers in different regions.
We had this discussion already over here in this topic:
/t5/Xperia-XZ-Premium/Charging-my-phone-doesn-t-seem-to-work-properly/td-p/1231842
@Kryptonian wrote:
Anyway, yes, it is indeed a quick charger, for I just called the customer support and they confirmed it. According to that gentleman, it'll take maybe a week or something until that charger starts charging faster; in the beginning, it's all about getting used to and stuff.
That it gets very slow starting from 80℅ is also normal; that's a precaution thing, so the battery won't get damaged etc. It does charge fast when the battery percentage is very low, yeah.
I hope this helps.
