"I've had iOS 18.1 installed for less than an hour and have noticed battery drain from checking email and scrolling."
"Too much battery drain if you switch on apple intelligence."
"Installing a new OS on an iPhone triggers a lot of stuff to go on in the background, from indexing to recalibrating the battery, and this can go on for hours or even days."
"If issues last for longer, it may be a good idea to check your phone battery's maximum capacity, located in the Battery tab in Settings."
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