Chosen Solution
I successfully completed this guide but when I put everything back together and turn it on, I only see the low battery indicator (even when plugged in) I left it plugged in for several hours but I only ever see low battery. Occasionally the screen will light up with the Apple logo and show the keypad. It even registers a couple of key presses but before I can enter the passcode the iPad turns off. What is going on here?
Double check if the battery connector is properly seated. I recently noticed something similar with an iPhone where the connector wasn’t 100%, but just enough for it to power on, but not to be properly detected in order for it charge.