In exchange for this power comes weight. The higher the voltage, the heavier the tool. Typically a 9.6 V drill weighs approximately 3 lbs. While an 18V drill weighs approximately 10 lbs. These higher voltage drills pack enough power to bore large holes in framing lumber and flooring.
Cordless drills are also available with different styles of handles .
One popular type is the T-handle. This type of handle is used to prevent slippage, accommodate a battery, and to provide you with better overall balance of the drill. If your using the drill for heavy duty drilling such as driving large screws you would be better off with a pistol grip drill which allows you to put pressure higher up and almost directly behind the drill. A cordless drill generally has an adjustable clutch where an electric does not. The clutch on the cordless drill will disengage the drive shaft whenever a preset resistance is reached, so not to strip out the screw or overdrive it.