Connect the red clip to the positive (+) terminal of the battery.
NAPA chargers range from manual models to "smart" microprocessor-controlled units. Napa Battery Charger and Noco Genius 10 - How They Work Napa Battery Charger Instructions
Before connecting any equipment, ensure your work area is well-ventilated to disperse hydrogen gas that may be generated during charging. Connect the red clip to the positive (+)