In situ x-ray diffraction has been shown to be a powerful tool for the study of the crystallographic changes that occur in a material as intercalation proceeds. Here we report the development of an zn situ cell based on coin cell hardware and Bellcore plastic electrode technology. The coin cell hardware makes construction very simple, the cells seal well and cycle just as regular coin cells do. Therefore extended in situ x-ray studies as a function of cycle number are now possible. We demonstrate the new design with preliminary experiments on LiMnO2 and LiMn2O4.