On iPhone 15 models, iOS 18 will recommend that users set a specific charge limit for their device based on their recent usage habits, with the aim of potentially improving iPhone battery life by reducing the time that the battery is fully charged.
All four iPhone 15 models have a setting that prevents devices from charging beyond 80% during activation, and iOS 18 expands the feature by adding new charge limit options of 85%, 90%, and 95%. With the new limit options, iOS 18 now takes a proactive approach to improving battery life by recommending a specific charge limit to users via a notification.
The recommendation also appears in the Settings app under Battery → Charging. The charge limit feature remains exclusive to the iPhone 15 line in the first beta of iOS 18, with the option not found on the iPhone 14 Pro or older.
In a related change, anecdotal reports suggest that iOS 18 may recalibrate some devices’ maximum battery capacity percentage. In Settings ➝ Battery ➝ Battery Health, “Max Capacity” is a measure of battery capacity relative to when the device was new. Lower capacity may result in fewer hours of use between charges.
The first beta version of iOS 18 is available to members of the Apple Developer Program, and a public beta will follow in July. After beta testing ends, the update should be widely released to all users with an iPhone XS or newer in September.
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