Using the DeWalt DCB606 battery is a breeze. First, make sure your tool is turned off. Then, insert the battery into the tool until it clicks into place. When you switch between different voltage tools, the battery will automatically adjust its power output. To check the battery's charge level, just look at the LED state - of - charge display. As for maintenance, keep the battery clean and dry. Avoid exposing it to extreme temperatures. If you're not going to use the battery for a long time, store it in a cool, dry place. And always use the recommended charger to keep it in top shape.