To check your iPhone battery, you can follow these steps:
1. Open the Settings app on your iPhone.
2. Scroll down and tap on Battery.
3. Here you can see your iPhone's battery percentage, usage history, and battery health.
4. If you want to see which app is consuming most of your battery, tap on Battery Usage.
5. You can also enable Low Power Mode to conserve your remaining battery by toggling the switch to the right.
You can also check your battery percentage on your iPhone's Home screen by swiping down from the top-right corner of your screen to access the Control Center. The battery percentage will be displayed at the top-right corner of the screen.