Credits and Round out
Battery info:
batteryuniversity.com/learn/article/whats_the_best_battery
Regulator info:
components.about.com/od/Components/a/Types-Of-Voltage-Regulators.htm
I hope this tutorial was helpful, and that you are more educated on the different types of power supplies, batteries, and regulators. When in doubt, ask on the Ez-robot forum. Anyone is a source of help.