The Nitecore D4 Didicharger has four batteries of varying sizes,it compatible with IMR,LiFePO4,Li-ion,Ni-MH/Ni-Cd batteries.The D4 incorporates an optimized IMR charging system that is able to monitor the entire charging process,ensuring end voltage is always within safe limits which ultimately helps extend battery life.It avoids overcharged and lead to safety issues when charged in regular Li-ion battery chargers. Intelligent charging circuitry selects the optimal charging mode (CC, CV and dV/dt) for a given battery and each of the D4’s four microcomputer-controlled charging slots then monitors and charges the battery independently. The D4 Digicharger is equipped with informative LCD display to give you vital information, right when you need it. The crystalline LCD display reveals the charging progress, battery type, voltage, charging current, and charging time in an easy-to-read and intuitive detail.