Biocompatible batteries (IMAGE) University of Oxford Caption The development of tiny, soft and biocompatible batteries to power minimally invasive biomedical devices is of critical importance. Here the authors present a microscale soft rechargeable lithium-ion battery based on the surfactant-supported assembly of silk hydrogel droplets. Scale bar: 400 μm. Image credit: Yujia Zhang. Credit Yujia Zhang. Usage Restrictions The image is for editorial purposes ONLY and MUST be credited. It MUST NOT be sold on to third parties. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.