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Do not plug the charger into a wall outlet until after the clips are connected to the battery.
Use a wire brush to remove corrosion or gunk from the battery posts to ensure a strong electrical connection.
Ensure the car's ignition and all accessories (lights, radio) are completely off. 2. Connecting the Charger
Before connecting any equipment, ensure your work area is well-ventilated to disperse hydrogen gas that may be generated during charging.
NAPA chargers range from manual models to "smart" microprocessor-controlled units. Napa Battery Charger and Noco Genius 10 - How They Work
Take off all metal jewelry, as it can conduct electricity and cause a short.