Which power tool is best for your home improvement project? We put different power tools and their batteries to the test to see which ones are stronger...and safer. We visit Consumer Reports to see how they measure the strength and performance of power drills. We'll also see how Lithium Ion batteries are made and find out how safe they are when we subject them to extreme temperatures, punctures and water. Also, which tools will help you build a deck quickly and efficiently? We pit four tools against each other in a race to see which one comes out on top.