(2) If the iPad is connected to the USB port on the keyboard of a computer that is turned off, sleeping or standby, the battery of the iPad may be exhausted and cannot be charged.
(3) If the current Mac or PC cannot provide enough power to charge the iPad, the status bar will display the message "Not charged".
(4) If you connect to a USB port on an old Mac or a USB port on a PC, keyboard or USB hub, the iPad may not be able to charge.
Extended data:
solution
1, iPad cannot be charged. Let's rule out the cause of temperature first. Because it is winter, the temperature in some places is relatively low, which is one of the reasons why the iPad can't be charged. This is because the iPad battery is very sensitive to temperature, so high temperature is not good, and low temperature is not good. If your temperature is extremely low, around 0 degrees, you can try heating the iPad. Put it in a warm quilt or take it to an air-conditioned room. After the temperature of iPad comes up, charge it to see if it can be charged.
2, the reason for the electric adapter, try another charger, it may be that the charger failed to charge. If there are redundant data cables, you can also replace them, or try to replace the power plug-in board.
References:
Iphoe official support for IPad charging problems