Stuck at dead battery image after screen replacement? [FIXED]

I've replaced a broken screen on an iPod Touch 4th generation, and the screen works fine.

After installing the screen, the iPod wouldn't turn on at all at first, so I followed advice found in a different question of grounding the +3.7 volt battery terminal, and this got the iPod to turn on. It was stuck at the Apple Logo though, so I gave up for the night.

Upon trying to use it now though, it only turns on while plugged in to a wall outlet or computer and shows the battery charging screen with charge in the red.

Image of screen: http://km.support.apple.com/library/APPL...

The device can enter DFU mode, and is detected by any computer while in it. When not in DFU mode, it is not detected but still shows the dead battery/charging screen.