I have a Black and Decker 3.6 volt screw driver. Its battery powered by the versa pak batteries. Model # is VP 720. It doesn't get used alot I'm sure there are more powerful types, however this one has always severed me well. Comes with an assortment of bits or drivers, and carrying case. Done a few storm doors with it full charge you can get old door off and new one on, yet still might have to hand tighten new door screws alittle more. I feel this is good for light to medium work .

Being this is the first thread here maybe we can go by a rating system 0-10 ,,0 being the worst 10 being excellant I'll give this 8