A cordless drill is an electric drill which uses rechargeable batteries. These drills are available with similar features to an AC mains-powered drill. ... They are available in the hammer drill configuration and most have a clutch, which aids in driving screws into various substrates while not damaging them.
Common types of drill bits.
Always Wear Protective Eyewear. Avoid Baggy/Loose Clothing. Loose sleeves, jewelry and hair can be a hazard when you are operating a power drill.
Secure Your Work Piece. Drill Pilot Holes or use center punch to start holes. Use a Drill Stand if necessary. Properly Set the Drill Bit - hand tighten chuck and make sure drill is spinning concentrically before tightening with chuck key.
Apply Proper Pressure to the Drill - not excessive. Peck drill if necessary. Drill only in a perpendicular direction to the materiel being perforated. Adjust the clutch according to material hardness. Never use drill bits to purposely elongate holes.
Sweep/vacuum any debris and clean/deburr any holes and put away drill bits & countersinks that were used.
Depending on the diameter of the drill and the hardness of the material being drilled it may be necessary to adjust the rpms of the spindle. Typically it is not good practice to mount larger drill bits (over .5") on a cordless drill. The amount of torque required to spin and produce the hole can sprain the user's wrist.