Ipad Pro Wont Charge After Battery Drain. The charge progress indicator is not displayed while your iOS device is turned off. If you have very low battery and plug into power a black screen or a black screen with a red battery might appear for a few minutes.
Make sure your computer is on while charging iPad via USB. Wait an hour while the battery charges then turn on the iPad. The next thing you can try is an old troubleshooting standby.
Close every app and restart your device.
You can troubleshoot the cable by connecting the iPad to your computer. After a full night of charging my battery went from 100 to 4 in less than 6 hours of onoff use iPad Air 4 user Rapid drain of battery when iPad Air 4 is in standby mode screen off with no background apps running and nearly every iOS feature also switched off inc Bluetooth just WiFi on iPad Air 4 user. You can troubleshoot the cable by connecting the iPad to your computer. In this case connect the iPad to a wall outlet using the cable and charger that came with it.