Users are posting on social media that iOS 18 is causing their iPhone batteries to drain quickly. Historically, it’s been temporary and is common with new hardware and a big OS update.
The annual Battery Drain Season is now in full force, as even long-term iPhone users are complaining that their battery charge is dropping quickly after updating to iOS 18. Long-term iPhone users, though, should know that this happened with iOS 17, too.
Källa: PSA: shorter iPhone battery life is normal when you first update iOS
