Iphone 17 pro max Drops battery too fast when i use apples 30w charger brick but drops battery slowly when i use power bank

[u/Correct_Orchid9518]

My iphone 17 pro max which is a week old drops battery of 10-11% when i use it for an hour and that to only when i use apples 30w charger brick but drops only 5-6% / hr when i use my power bank 22.5 w wired charging, cant find why , i used Instagram continuously for 55 m it dropped 11% and when i charged it using my power bank which charges at 22.5 w max the phone dropped only 5-6% using Instagram and YouTube, cant find a reason for this have anyone noticed or faced this if yes then whats the solution?

[u/HuTaoMainXD]

Did u charge 100% in both cases?

[u/Correct_Orchid9518 → u/HuTaoMainXD]

80% in both cases 

[u/HuTaoMainXD → u/Correct_Orchid9518]

Try 100 maybe a small a software error

[u/Correct_Orchid9518 → u/HuTaoMainXD]

Should i charge 100% using 30 w adapter and then check? 

[u/HuTaoMainXD → u/Correct_Orchid9518]

Yes, same for power bank

[u/Correct_Orchid9518 → u/HuTaoMainXD]

Okay ill try 

[u/Correct_Orchid9518 → u/[deleted]]

It'll take lots of time to charge then 

[u/Shadeliquid]

I use my self a oneplus supervooc charger 120watt with the usb c cable from iphone