Adding external power to a tablet

Youtube video: https://www.youtube.com/watch?v=IJ120djyGn4

This project gave a second life to my old useless Acer tablet. It had a dead battery, but what's worse - this tablet doesn't work from an external micro-USB power supply (it can only use the micro-USB connector for charging the battery).

But there is a pretty easy way to give a second life to such tablets - one just has to replace the internal battery with an external power supply.

Here are the steps I took to do the conversion for my Acer (can also work for many other cheap tablets):

* First I cut the 3 wires between the battery and the connector, inside the tablet. They are red (for +power), blue (for -power), and yellow (for the thermistor inside the battery - to monitor its temperature). I measured the thermistor to be a 10k type. The voltage of my battery is 3.7V.
* Then I very carefully dislodged and removed the battery from the case (it is glued there) - be very careful not to puncture or break it; use gogg