SOLVED !!!,! Im so happy today my tablet is finally charging! Ive had the lil red x over my battery for weeks now when I was lucky enough to actually have it on. When it would die I would get the awful two orange bars on a dead screen that would shut off.
This is what I did, with a dry q-tip and tweezers I very very gently cleaned some dirty grime that was in my tablets charge thingy. Plugged it in but still just the two orange bars. I waited and played w the power button and volume down button. Still nothing. Tonight for the heck of it I pressed VOLUME UP about ten times really quick. Then tapped the power button AND VOILA THE BATTERY CHARGED AND NO MORE RED X EITHER, hope this helps some of all.