Using your DeWalt PowerStack battery starter kit is easy. First, insert the battery into your compatible DeWalt tool. Make sure it clicks into place securely. When it's time to charge, simply connect the battery to the DCB1104 charger. You can check the state of charge using the two - stage LED indicator on the charger. As for maintenance, keep the batteries and charger in a dry and cool place. Avoid exposing them to extreme temperatures. If the battery gets dirty, use a dry cloth to wipe it clean. Don't try to disassemble the battery or charger on your own, as it may void the warranty and be dangerous. Also, when not in use for a long time, it's a good idea to charge the battery to about 50% to keep it in good condition.