STANLEY BC6809 6/8 Amp Automatic Battery Charger 6 Amp Automatic Battery Charger/Maintainer with 8 Amp Boost Automatically selects charge rate from 0 to 6 AMPS to maximize battery life, charge speed and maintenance 3-Stage high-frequency automatic rapid charge with Float Mode Monitoring Easy to read LCD screen with clear information Spark resistant reverse hook up protection and reverse polarity indication; CEC certified