800 screws with a 2.0ah battery 1200 with a 2.5ah battery @ overanalyze, even for bigger jobs the 12v gun has amazing run time. that thing is just so tiny. yeah its a tough decision, 12v vs 18v gun. but i think the 12v comes more in handy; super lightweight ( 0,9 kg with the 2.5 Ah battery) , the 18v with a 4.0 gonna be on the heavy side. ( 1,6 kg with the 4.0 Ah battery) 18v gun gets 3400 screws with a 4.0ah battery