With help from @oldturkey03 , I realized I severed the flex cable attached to the power/volume connector when I removed the back cover. Now I will have to take off the screen to get to the other side (once I have the replacement part). The new battery has charged to 100% now, but with the broken flex cable, the tablet will not turn on.
When removing back cover, remove the side opposite the power/volume buttons. After prying that side up, gently pop the connector out of the cover side (shown on left) before completely removing the cover. IF it looks like this after removing the cover, the flex cable is broken.
[image|2566970]