Using your DeWalt 20V MAX Powerstack Compact Battery Two - Pack is a breeze. First, make sure your DEWALT 20V MAX* tool is turned off. Then, simply slide the battery onto the tool until it clicks into place. You're ready to start working. When it comes to charging, use any DEWALT® 20V MAX* charger. Just connect the battery to the charger and plug it into a power source. As for maintenance, keep the batteries clean and dry. Avoid exposing them to extreme temperatures, as this can affect their performance and lifespan. Also, check the LED fuel gauge regularly to know when it's time to recharge. If you notice any damage to the battery or the overmolded base, stop using it immediately and contact DeWalt customer service.