1.This charger can only be filled with cylindrical lithium ion battery (3.7V), nickel-hydride/nickel-cadmium (1.2V). 2.It Can automatically identify lithium (Li-ion 3.7V) battery and nickel metal hydride (Ni-MH) battery. 3.Multiple safety protection functions such as overcharge, over discharge, short circuit, and reverse connection protection can automatically and automatically identify bad batteries. 4.AC110-240V (50/60Hz) input (standard built-in power supply), four-slot independent charging and microcomputer management system. 5.Charging current is intelligent automatic selection, there are 2 levels (1000mA/2000mA) for you to choose from, 2000mA is designated as the 1 slot. 6.LED charging display lamp can display charging state 25%, 50%, 75%, 100%.