I am surprised and disappointed to discover that a new, fully-charged C15 left 2-1/2" drywall screws 1" proud before shutting down. Torque set at 25 and speed setting on #1. I was attaching 1-1/2" fir to 2" fir. Seems that it would quit just as the screws tried to enter the second piece of fir. I did not pre-drill since the screws are self tapping and my 18v DeWalt never experienced this problem in the past. Based on many comments here on FOG, I expected that the C/T15s would "out-torque" even 18v drills. Well, I switched to my 8-year old DeWalt and sunk the same screws as deep as I wanted with absolutely no problem.