Here’s a list of things to help prevent your phone’s battery from draining while charging:

1. Clean the charging port: Unplug the charger cable, use a cotton swab with rubbing alcohol to scrape the sides of the charging port, and clean it.
2. Reboot your phone: Hold down the power button for a few seconds to make sure your phone is restarted properly.
3. Keep your device up to date: Update software for your phone regularly to get the latest version.
4. Adjust your power-saving settings: If your device has a battery-saver mode, try setting it up and see if that helps.
5. Change the charger port: If you’re using an old charger, try using a different one that is compatible with your device.