Hi! joshua morgan it seems that your Battery is Defective. try to replace it or use a Multimeter to your Laptop Battery. using this guide. Como usar un Multímetro
Maybe the only solution on that problem is Hard Reset, try to check this link below .(http://www.smartmobilephonesolutions.com...-to-hard-reset-an-android-phone)
Try to Charge it to Laptop or Desktop and then observe if the storage of your device is Detected. Here’s the reason why its not charging : (1) Faulty Battery (Try to Replace it) (2) Faulty Charger (Try to use Other) (3) Charge it for 1 hour wait (Maybe the battery is Drain) (4) Faulty Sub Board (Try to take it to Repair shop or if you want it to do with your self check this Samsung Galaxy Tab A)
Try to Factory reset your Tab it will default all of your settings, the reasons why the is so fast to drain is because of the usage and performance.. When your Device is in the idle mode try to off (Wifi, Data, Bluetooth and other apps. including the other tab)