iPad Air 4th Generation 10.9

Not charging. I replaced the screen and the battery to get it working and realised after the second battery ( that I imported from the US) that its not the battery. I know the screen works because the battery had a charge before it died after diagnosing it. Im including the adhesive strips for the screen too so its a quick assembly once the charging issue is sorted. The battery is also from the US and its brand new. The power button has a small crack which you will see from the photos. I did replace this as well with no luck. It comes with a Hello Kitty case.