While Nimbus doesn’t have an internal battery, you can power it using portable battery packs that include an AC outlet. These act like external rechargeable power sources. For example, products like the Powkey Portable Power Bank (available on Amazon and other retailers) can power Nimbus for outdoor or street performances.
Chaos Audio is also working on an official Nimbus battery pack add-on for even greater convenience, though no release date or specifications are available yet.