Transformer pad not working and charging

Li-Ion battery packs have a microchip that controls the charge and discharge levels. When the system shuts down due to a low battery, never turn it back on until it is plugged in and charging again. The circuit in the battery will prevent the battery charging again if it's discharged too low as the batteries become unstable at low charge levels.

You may never get it to charge properly again. But you can try bump charging to bring the levels up high enough for the microchip to allow regular charging. What you do is turn off the tablet. Plug the charger in directly to the tablet (don't use the dock if you have one) and wait about 10 mins. Then unplug it, wait a minute, then plug it back in for 10 mins.

Repeat this cycle about 5-10x to see if it bumps the voltage/charge level up enough to reset the microchip's charge circuit. If it works, you will be able to recharge again normally (don't leave it unattended while fully charging the first 2-3 times). If not, the battery is ruined and you're out of luck. A repair center may be needed to replace the battery.