If the battery percentage (see the following picture) is shown on the top-right corner of your iPhone or iPad, you can know how much battery capacity remains to be used at a glance. And this article shows you how to display it by turning on Battery Percentage.
Step 1: Open Settings > General > Usage.
Step 2: Find Battery Percentage and click the switch to turn it on.
Tip: To turn off Battery Percentage, get into Settings/General/Usage and click the switch beside Battery Percentage.
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