The SeQual Eclipse External Battery Charger charges extra batteries while the SeQual Eclipse charges one. If you have extra batteries it is always nice to have a desktop charger to charge extra batteries at the same time. You never know when a emergency is going to come up, so you always want to make sure you have batteries fully charged at all times! When you are on a trip it is less time spent in the hotel room waiting for your batteries to charge up as well!