"This Dual Battery Charger conveniently charges 2 batteries dynamically to give you a fully charged battery as soon as possible1 so you can keep adventuring. Quick-check status lights let you know the batteries’ charge status even when you’re not plugged into power. Comes with 2 high-performance Enduro batteries that you can use as replacements or spares for HERO13 Black. 1 Use a 27 watt or greater USB-C adapter for optimal charging performance."