Using the DeWalt DCD445B is easy. First, make sure the battery is properly inserted. You can then select the appropriate bit for your task and quickly change it using the 7/16 - inch hex quick change chuck. When drilling, keep the tool steady and apply even pressure. If you feel the tool binding up, the E - Clutch® System will shut it down automatically for your safety. To get the most power, use a DCB609 pack. You can use a Hole Saw for larger holes up to 4 inches or a self - feed bit for holes up to 2 - 9/16 inches. With the Tool ConnectTM Chip installed, you can use the app to keep track of the drill on the jobsite. As for maintenance, after each use, wipe the tool clean with a dry cloth. Keep the battery charged and store it in a cool, dry place. If you notice any problems, it's best to take it to a professional for inspection.