Check the iPhone battery health and usage
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Insights and suggestions: You might see insights about conditions or usage patterns that cause iPhone to consume energy. You might also see suggestions for lowering energy consumption. If a suggestion appears, you can tap it to go to the corresponding setting.
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Last Charged: Indicates how fully the battery was last charged and the time it was disconnected.
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Battery Level graph (in Last 24 Hours): Shows the battery level, charging intervals, and periods when iPhone was in Low Power Mode or the battery was critically low.
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Battery Usage graph (in Last 10 Days): Shows the percentage of battery used each day.
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Activity graph: Shows activity over time, split by whether the screen was on or off.
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Screen On and Screen Off: Shows total activity for the selected time interval, for when the screen was on and when it was off. The Last 10 Days view shows the average per day.
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Battery Usage by App: Shows the proportion of the battery used by each app in the selected time interval.
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Activity by App: Shows the amount of time each app was used in the selected time interval.
Go to Settings > Battery.
Information about your battery usage and activity appears for the last 24 hours and up to the last 10 days.