Reduce Screen Brightness or Use Auto-Brightness

Your screen is responsible for draining the most battery life out of your iPhone, especially when it’s set to full brightness. If you’re indoors or in a low-light environment, you likely don’t need it that high.

To manually lower it, swipe down from the top-right corner to open Control Center, then drag the brightness slider down. If you’d rather let your phone handle it, go to Settings > Accessibility > Display & Text Size and toggle on Auto-Brightness. This helps your screen adjust to ambient light while also saving a little more power.