This kit includes both an EN-EL15b replacement Li-Ion battery and a charger. By using the ProMaster external charger in this kit you can charge a spare battery at the same time you are using your camera.
The charging unit is made up of 3 components: a charging base, AC adapter, and USB charging cable. By using the base and USB cable you can charge the EN-EL15b battery from the included AC adapter OR from a common USB port! Use it at home, in your car, or on the go to ensure your Nikon camera always has ample power.