12A battery charger and tester 7 stage charging process LCD digital display Various charging modes included: 800mA maintainer mode, charging currents selectable, repair mode, winter mode Battery type selection: normal lead-acid battery, and AGM specially for start/stop engine(6859U) Testing mode: battery level, battery cranking ability, battery CCA (6859U only), alternator performance Power the ECU when changing the battery Built-in hook for hanging Protection: over temperature, short circuit, reverse polarity connection