Using the DeWalt DCK205P1 combo kit is easy. First, charge the 20V MAX* XR 5Ah battery with the 8 Amp Fast Charger. Once charged, insert the battery into either the 1/2 in. Mid-Range Impact Wrench or the 3/8 in. Compact Impact Wrench. For fastening tasks, select the appropriate wrench based on the size and torque requirements. When using the DCF894, the Precision Wrench™ Control helps you avoid over - tightening. Make sure to hold the tool firmly, especially when dealing with high - torque applications. For the DCF890, its compact size allows you to reach tight spaces easily. The 3 LEDs on it provide good visibility in dim areas. As for maintenance, keep the tools clean after each use. Wipe off any dirt or debris. Regularly check the battery for any signs of damage. If you're not using the tools for a long time, store the battery at a proper charge level. Avoid exposing the tools to extreme temperatures or moisture. This will help keep your DeWalt DCK205P1 combo kit in good working condition for a long time.