GooKit Desktop Charger Case + 900mAh 3.7V Li-ion Rechargeable Battery for ANART SPC-01, GooKit Sports camera, for SJ4000/5000/6000 The GooKit Cradle Charger is an excellent charger and easy to use. Plus, it's perfect when you want to get back to recording and not waiting for your battery to charge. Having a spare battery gives you about 1 hours of record time after you swap out the battery, which is very simple to do. Easy To Use- Just put the Camera's USB Cord you have with your camera into the USB Port or USB Outlet Adapter and the other end into the Charger, than the battery and begin charging. The charging cradle and rechargeable battery. While one needs charge you can use the spare to continue recording. High Capacity 900mAh 3.7V 3.33WH Backup Rechargable Li-ion Battery. It works well charged fast and cradles them when they are charged. Small and convenient when traveling. Well made design, not easy to break or fall apart. Just what you need to recharge a battery when it's power is low. It will give you double the recording time with your GooKit or ANART sports camera.