If you let your Cube Talk 9X tablet battery die completely, sometimes it has an issue where it will not charge.
I own one myself and was upset when it seemed it had “died” only after a few months use.
After some extensive research and a bit of a luck, I did find the solution!
The power button needs to be held down for several minutes while the tablet is plugged in in order for the tablet battery to come back to life. The easiest way to accomplish this is to simply place an elastic around the tablet that will hold the power button.
After you do that, plug in your tablet. Leave it for about 20 minutes then check it. Remove the elastic and press and hold the power button for a moment (keep the tablet plugged in though).
Your Cube Talk 9X should start up and likely show 1% charged. I recommend doing a full charge before unplugging it again.