Store and charge up to three batteries for your Osmo Action 3 or Osmo Action 4 camera with this Multifunctional Battery Case from DJI. The case stores three batteries and can also fast charge them simultaneously. The case can be powered by an external power source via its USB-C port, and it can also act as a power bank to power other devices via that same port. The case even stores two microSD cards to keep them safe and protected.