For iPhone 15 models, iOS 18 will advise users to set a specific charge limit for their device based on their recent usage patterns, with the goal of potentially improving iPhone battery life by reducing the amount of time it takes for the battery to be fully charged.
All four iPhone 15 models have a setting that prevents the device from charging above 80% when turned on, and iOS 18 expands on this feature by adding new 85%, 90%, and 95% charge limit options. With new limit options, iOS 18 now takes a proactive approach to improving battery life by recommending a specific charge limit to users through notifications.
Recommendations will also appear in the Settings app under Battery → Charging. The charge limit feature remains exclusive to the iPhone 15 series in the first iOS 18 beta, with the option not available on the iPhone 14 Pro or earlier.
In a related change, anecdotal reports suggest that iOS 18 could recalibrate some devices’ maximum battery capacity percentage. In Settings ➝ Battery ➝ Battery Health, “Maximum 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 iOS 18 beta is available for Apple Developer Program members, with a public beta to follow in July. After beta testing is complete, the update should be widely released to all users with an iPhone XS or later in September.
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