My XS Max Case lasted from 11am Friday once fully charged and by 11am Saturday was at 30% never once using my IPhone battery. I’m a normal to sometimes heavy user. I’m very impressed exceeding my expectation and seems to be more effective then the Mophie case I returned. I also had the Mophie IPhone 8 Case and still do. For me the smart aspect is totally worth it and I’ve found my quick charging brick with a normal lighting cable seems to charge the Apple Smart Case really fast. I have seen the reports on my side with the wireless charging % amount jumping around and I’ve seen the display issue of both status of battery’s charging issue. I believe they’ll fix that in future IOS upgrades so no deal breaker for me. Don’t get me wrong the Mophie case is really nice I think it boils down to personal preference based on the features-material etc.