This double battery charger of 18V, 2 x 3.5A has an ultrafast charging. It is an ultra highly efficient charger that uses the best low power dissipation electronic component which release little heat. It also has an intelligent multi protection charger with integrated software and hardware. It has a protection against overcharging, over-current and overheating that may be caused by hardware problems. If an issue occurs, it will stop charging and shows fault conditions through different LED light. It also has an intelligent voltage equalization, that it will communicate digitally with the battery when charging, and each battery cell is fully controlled. This helps to prolong the battery pack life. Suitable for Cofan batteries.