This kit includes both a NP-W126S 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 NP-W126S 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 Fujifilm camera always has ample power. ProMaster batteries are a high quality, long lasting power source for your digital camera or camcorder. All ProMaster replacement batteries are manufactured to meet or exceed the equipment manufacturer s specifications.