NOT CHARGING APPLE A1337 64GB

Apple support suggests several possibilities. The iPad may not be receiving sufficient power to charge it; some lower powered charging devices are lacking. The charger may not be Apple certified (as being adequate). Test an alternative charger. Or, the port may be dirty or damaged. Remove debris. Try another USB cable. Restart the device. Also, determine whether or not you have the latest ios operating system. If it still does not charge, contact Apple support for service.

For more detailed instructions: https://appletoolbox.com/ipad-air-charging-very-slowly-or-not-charging-fix/

Try another charger. Some usb2 chargers will not work with a usb1 charger.

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Have you tried this?

Restart your iPhone, iPad, or iPod touch - Apple Support

https://support.apple.com > en-gb
9 Dec 2015 - Press and hold the Sleep/Wake button until the red slider appears. Drag the slider to turn your device completely off. After the device turns off, press and hold the Sleep/Wake button again until you see the Apple logo.

Maybe you should try a new charger.
Their wires a really weak!
Try it in your local Apple store.
Before buying any thing, ofcourse.
And if it's not 'that'.
They may help you out in some other way.
Not my best help out ever! But that is what I got.
C.

reset your computer or phone or.

It could possibly be a problem with the charging cable , buy a new one and see if it works properly then .

You must use the Apple charger or allow extra time if using a non-Apple device. The standard output for a USB charger is 5 volts but Apple uses 5.17 volts. The battery icon at the top of the screen should show a bolt symbol when connected for charging. If it does not you may have a bad cable.

To get Ipad to show as charging download Asus AiCharger from web and restart computer after install.Plug in usb from Ipad and should now show charging.

I request you to visit the below url for your query
http://support.apple.com/kb/TA44551