Using this Battery Tender Junior 800 charger is easy. First, make sure the charger is unplugged from the wall. Then, connect the alligator clips or the ring terminal harness to your battery, following the correct polarity (positive to positive, negative to negative). After that, plug the charger into a 120 - volt wall outlet. The charger will start charging your battery automatically. Once the battery is fully charged, the charger will switch to a maintenance mode to keep the battery in good condition. When not in use, store the charger in a dry and cool place. Avoid exposing it to extreme temperatures or moisture. Also, check the connections regularly to make sure they are tight and clean. If you notice any damage to the charger or the cords, stop using it immediately and contact the manufacturer for assistance.