Fast charging not fast at all on xperia xz3

[Ludo3]

Hi, 

I just bought a new xperia xz3 but the charging time is sometimes fast (2,5h) but sometimes really long (5,5h).

Does someone know what could be the problem? 

I also tried an old charger from my old xz1 but issue is still here. 

[ChrisChy1]

you need PD 18W adapter！it fast! 30min can 20%-->65% or more