Preface to the Special Issue of ChemSusChem on Organic Batteries.

All about Organic: Guest Editors Philippe Poizot, Yan Yao, Jun Chen, and Ulrich S. Schubert provide their thoughts on organic batteries-the challenges they face, their advantages and disadvantages, and what needs to be done to make them a commercially viable option-in this preface to a special issue of ChemSusChem on organic batteries, with highly interesting contributions from scientists around the world.