The 4-bay i4 Intellicharger Battery Charger Base from Nitecore provides an all-in-one charging solution for many commonly-used cylindrical rechargeable batteries. It is compatible with Li-Ion, Ni-Cd, and Ni-MH battery chemistries and battery sizes from AAA to 26650. The base automatically detects the needs of each battery inserted and determines the correct charge for it. Additionally, it will set the charging mode from constant voltage, constant current, or trickle-charge. Each bay has independent charging circuitry, so different chemistries, capacities and sizes can be simultaneously charged. Power and charging status LEDs clearly show the progress of each battery.