Main Features: - 4 slots: 3 kinds of charging currents can be selected (500mA/1000mA/2000mA), and 2000mA is designated as the fourth slot - LED indicator light design: it can display the state of charge 25 percent, 50 percent, 75 percent, 100 percent; also display the battery type NiMH 1.2V, Li-Fe 3.2V, Li-ion 3.7V, Li-ion 3.80V (IMR) - Automatically identification of Li-ion 3.7V and NiMH battery, manual selection of LiFePO4 battery and Li-ion 3.80V battery (IMR) - There is a 0V voltage activation function, 1.65 - 2.20V cannot be charged (but there will be activated current turbulence type charging) - Overcharge and over-discharge, short circuit, intelligent identification of bad batteries and reverse battery detection protection