Having the brightness too high on your iPad can cause the battery to drain very fast, especially when the screen is on for a long time during video conferencing.
To change the brightness, open Settings.
Tap on Display and Brightness and use the brightness slider to adjust the brightness.
iPads have a feature that will automatically turn the display off after a certain amount of time. If this is disabled, the display will not turn off unless the power button is pressed, which will drain the battery very quickly.
To turn on Auto-Lock, open Settings and go to Display and Brightness as shown above. Then tap on Auto-Lock.
Select the amount of time the device will wait before the screen automatically turns off.
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