It sounds like you had Voice Over enabled in the Accessibilty Settings. Are you are able to start the iPad now? It sounds like that is an issue as well.
This explains how to turn Voice Over off and on.
You don't need or necessarily want to let the battery run down at all. If you let the battery run down and then recharge, that will not reset the device.
If the iPad is not responding at all, look through this for help in order to get the iPad up and running again, and then you can deal with Voice Over.