The Nitecore UM20 has the ability to charge Li-ion and IMR cylindrical rechargeable batteries. These are two charging slots that allow monitoring and charging the batteries independently.
The LCD screen displays the process and battery level at real-time. With the USB output, you can charge your phone and battery at the same time. It is a great battery charger if you are on-the-go. To keep everything organize, there is a USB cable winder.