From Thinkgeek:
Ok, so the MimoPowerTube – Star Wars Series power banks don’t do anything except power your smartphones, mp3 players, etc. BUT, they are available in Star Wars designs (like Darth Vader or Luke’s Lightsaber from Episode IV), which means we instantly love them. About the same size as a C1 personal comlink, each of the MimoPowerTube – Star Wars Series power banks will boost the play time of your electricity-hungry devices. MimoPowerTube – Star Wars Series – may the Force of charging be with you.