BLACK+DECKER BCS10B 10 Amp Simple Battery Charger Features a simple selector dial for easy operation which allows dialing into a function and letting the charger do the rest Offers fully automatic process that charges up to fifty percent faster than other conventional chargers Consists of reverse polarity alarm which warns against improper connections to battery Contains a LCD screen that displays the battery voltage, charge rate and battery diagnostics Alternator check provides alternator diagnostics