  Recent years have witnessed an explosion of interest in quantum devices for
the production, storage, and transfer of energy. In this Colloquium, we
concentrate on the field of quantum energy storage by reviewing recent
theoretical and experimental progress in quantum batteries. We first provide a
theoretical background discussing the advantages that quantum batteries offer
with respect to their classical analogues. We then review the existing quantum
many-body battery models and present a thorough discussion of important issues
related to their open nature. We finally conclude by discussing promising
experimental implementations, preliminary results available in the literature,
and perspectives.
