Too fast charger reduces the life of the batteries. The number of charge cycles decreases when a battery is charged faster than his physical ability to accept charge. This results in a charge surplus unabsorbed by the cell which is released as heat. Too hot to the touch battery is a sign that your charger is being "cook" the service life of the battery! This charger is ideal for storing your batteries in optimum condition ... it uses a microprocessor to finish off the load (-dt) and a thermal protection that cuts the load.