This speed charger charges 12-volt batteries in less time than conventional chargers. It has a built-in microprocessor which senses battery and charging system status, adjusts charge rates, automatically shuts off when full charge is achieved, and diagnoses problems. The 15-amp fast charger monitors battery condition and adjusts the charge rate to prevent battery damage. It is ideal for car, truck, marine, RV, farm equipment, AGM, gel cell, and deep-cycle batteries. The 10-amp fast charger has a self-adjusting charge rate for everyday charging needs which keeps your battery in peak condition. The 2-amp slow charger charges small batteries and maintains large ones and charges motorcycle, ATV, snowmobile and lawn tractor batteries.