Charging shuts off when battery is fully charged.
Meter shows current being drawn. Green light indicates full charge. Red light indicates connection to battery is in reverse.
Specifications:
Manual 10 Amp charge at 12v
Manual 10 Amp charge at 6v
Automatic 10 Amp charge at 12v
Automatic 2 Amp charge at 12v
55 Amp engine start at 12v
Manual 2 Amp charge at 12v