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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. Napa Battery Charger Instructions
Use safety glasses and gloves to protect against battery acid and potential sparks. Do not plug the charger into a wall
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
Ensure the car's ignition and all accessories (lights, radio) are completely off. 2. Connecting the Charger