This listing includes: Nitecore NEW i4 Intellicharger 2016 with a bonus 18650 Battery Case Features Twice the charging speed of the i4 charger Active Current Distribution (ACD) Technology Compatible with 1.2V, 3.7V, 4.2V, 4.35V batteries Charging program optimized for IMR batteries Automatic current selection based on battery capacity Automatic detection of non-rechargeable Lithium batteries Terminating threshold for battery voltages and charging current can be set independently for each slot Capable of charging four batteries simultaneously Automatic adoption between three charging modes (CC, CV, and dV/dt) Automatically detects battery power status and displays charging progress Automatically stops charging upon charging completion Reverse polarity protection and short circuit prevention Over-discharged battery recovery Overtime charging protection Designed for optimal heat dissipation Made from fire resistant, flame retardant