Using the DeWalt DCG418X2 grinder is straightforward. First, charge the DCB609 FLEXVOLT 9.0Ah batteries using the included charger. Then, insert a fully - charged battery into the grinder. Attach the appropriate guard (either the 4.5 - inch or 6 - inch Type 27 guard) with the flanges and wrench. You can also attach the side handle for better control. When you're ready to start grinding, press the trigger. The grinder has a no - load speed of 9000 rpm, which is great for applications with 6 - inch grinder wheels. Just keep in mind that when you release the trigger, the brake will engage and stop the wheel in 1.5 seconds if you're using a standard grinding wheel. For safety, always wear appropriate protective gear like goggles and gloves. When you're done using the grinder, store it in the kit bag provided. To keep it in good shape, regularly clean the grinder to remove dust and debris. Also, check the battery's charge level and recharge it when needed. Don't forget to inspect the guards, flanges, and other parts for any signs of wear or damage before each use.