The 60108m is not a simple "dumb" charger. It includes microprocessors for automatic operation. Here is what the unit offers:
: Always charge in a well-ventilated area to avoid dangerous gas buildup [5.1]. everstart battery charger 60108m manual
On 12V/2A (trickle charge), it safely charged a motorcycle battery overnight. On 10A, it revived a deeply discharged car battery in about 4-5 hours. The 30A setting gets hot and is best for short bursts. The 60108m is not a simple "dumb" charger