It can store and charge batteries. When used with the DJI 65W Portable Charger, it can fully charge 2 Intelligent Flight Batteries simultaneously in just 70 minutes.
With at least one battery stored, it can serve as a power bank, using the remaining battery power to charge devices such as goggles or smartphones.

Tips
Parallel charging requires the DJI 65W Portable Charger or a charger with at least 65W output, 4.3A current at 15V, and PD protocol support, along with a charging cable rated for at least 5A and also supporting PD protocol. Otherwise, batteries will be charged individually.