Tech Support Note: The Schumacher 5 amp automatic charger features a single light that changes from red (charging) to green (charged). A phased charger, it has a pulse phase (approximately 15 minutes) a charge phase, and then a 55 minute topping phase. If you charge the battery, detach the clips and then attach them again, the charger will again go through the topping cycle and will remain red for at least another 55 minutes. The charger will flash red and green if there is a fault with the battery or charger.
This charger is programmed specifically for a 31 amp hour battery. NOTE: Some customers experience compatibility problems after the first year if they use other batteries.