I used 2 Makita battery drills. One 9.6 volt and one 12 volt. Used one for pilot holes and other to set screws. 700 square foot deck with railings and is 12 feet above ground. 3500 deck screws. 2 batteries for each drill. This was done 10 years ago. Did not know about stainless deck screws at that time ( or if they were available) Going to replace all now with SS screws as the origanal ones have rusted. Composite deck material. Will cost about $300 for screws. WW