NAPA Smart Chargers give you fine control on how you charge your batteries, thanks to advanced microprocessor technology. NAPA chargers automatically detect battery state to shift between 9 unique charging stages. Say goodbye to the days of overcharging and battery damage! NAPA Smart Chargers use advanced microprocessor technology for fine control over the way you charge your batteries. NAPA Smart Chargers blend intelligent design with robust technology for a truly next-generation experience.