The Dual Battery Charger doubles down on the charging action. Now you can juice up 2 batteries simultaneously, giving you fully charged batteries as soon as possible so your HERO13 Black is always ready to go.1 Quick-check status lights let you know the batteries' charge status-even when you're not plugged into a power source. It comes with 2 high-performance Enduro batteries that can be used as replacements or spares for the battery that came with your camera.