The Nitecore D4 is a universal smart charger compatible with almost all cylindrical rechargeable batteries. The D4 automatically detects Li-ion, Ni-MH and Ni-Cd batteries, and through manual selection is also capable of charging LiFePO4 batteries. Intelligent charging circuitry selects the optimal charging mode for a given battery and each of the D4’s four microcomputer-controlled charging slots then monitors and charges the battery independently. Furthermore, an integrated digital LCD screen displays charging progress, voltage, current, and time while an intelligent automatic power-off function terminates current when charging is complete. The Nitecore D4 is one of the most advanced chargers on the market today!