Using your DeWalt DCB205-2CK starter kit is a breeze. First, take the batteries out of the tool bag. Insert them into your 20V MAX* tools when you're ready to work. The 3-LED fuel gauge on the battery will tell you how much charge is left, so you always know when it's time to recharge. When charging, just connect the battery to the charger and plug the charger into a power outlet. It's that simple. As for maintenance, keep the batteries and charger in a dry place. Avoid exposing them to extreme temperatures. If you're not going to use the batteries for a long time, it's a good idea to store them with a partial charge. This will help extend their lifespan. And remember, these batteries are compatible with all 20V MAX* tools, so you can use them with confidence across your DeWalt tool collection.