Brand new smart battery case for iPhone XS not working
I bought a brand new Apple smart battery case for the iphone XS from eBay ($45)
charged it till it went green on the LED inside the case. but when i connect my iPhone XS, it shows the case icon in the battery widget, but it doesn't show the battery status of the case nor does the case charge my iPhone.
when i plug the case to power (with the iphone in it) it takes a while but eventually shows both iPhone and battery charging (even though the battery case is full, the battery widget shows the case @ 75%).
taking out the charger, the case doesn't charge my phone (my phone is at <50%).
I bought another smart battery case from Apple store via Amazon ($129) cos i thought maybe the one i got from eBay is a fake, but it does the exact same thing.
any idea what is causing this? 2 cases now and same issue. Is there something wrong with my iPhone XS? It's running the latest iOS.
Should I just buy the Mophie battery case? and return these Apple smart cases? or is the issue my iPhone
iPhone XS