Nitecore UM20 Charger Micro USB 18650 Battery Charger Nitecore UM20 USB Powered Battery Charging System Input voltage: Micro USB DC 5V Output voltage: 4.2V 1% 5V Output current: 1000mA 500mA Compatible with: Li-ion IMR: 18650, 18490, 18350, 17670, 17500, 16340(RCR123), 14500, 10440 USB powered Li-ion battery charger