The Efest LUSH Q4 Charger is a quad slot charger which automatically charges at a rapid 2.0A charge with one battery, a 1.0A charge with two batteries and a 0.5A charge with three or four batteries. This Lush Q4 features a simple no button design with a battery life LED indicator light. This LED indicates that your battery is charging and when it’s fully charged. Each slot is monitored independently to facilitate the most efficient charge. The Efest LUSH Q4 Charger features reverse polarity, short circuit, overcharge protection and many more safety features. This device is able to charge various types of 3.6V/3.7V lithium batteries commonly used in electronic cigarettes, flashlights, electric tools, and more.