Drastic battery draining using safari on IOS 18
I noticed a drastic battery draining after using safari possibly on the background after upgrading to iOS 18.
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The information in the If the battery in your iPhone drains too quickly - Apple Support may help, including the following excerpt:
If battery life is less than expected after an update
If you notice that your battery life has decreased after updating your iPhone, wait a few days and then check again.
Even though you can use your iPhone immediately after an update, certain tasks related to the update continue in the background and might affect battery life and thermal performance.