Schumacher SE12-50 Manual Traditional Battery Charger, 10/30/50 AmpHighlights: Will charge conventional, maintenance free 30 amp fast charge increases battery power quickly Output increases from 30 to 50 amps when cranking engine Rocker switch with off position for safe easy use Charge at regular or fast rate Assists battery in cranking an engine Great starter charger for 12 volt batteries Charge at a fast rate, or assist a battery in cranking an engine 50 Amp engine start for emergency starting 10 Amp fast charge