Why Do Ipads Say Not Charging. In my experience at least that message means that the iPad does see voltage on the chargesync cable but it believes that the source does not supply sufficient power to both operate the iPad and charge the battery. If you dont have those contact Apple Support.

Make sure your computer is on while charging iPad via USB. So it warns you that the battery is not being charged. Make sure your iPad isnt too hot or too cold.
Make sure your iPad isnt too hot or too cold.
Your ipad is having a charging problem and you dont know what to do. In my experience at least that message means that the iPad does see voltage on the chargesync cable but it believes that the source does not supply sufficient power to both operate the iPad and charge the battery. Use a different power adapter or a different charging cable. If iPad is connected to a computer thats turned off or is in sleep or standby mode the iPad battery will continue to drain.

