For controlling power sequence in a blade center environment, a relationship component module creates a topology of interdependent relationships of devices in the blade center environment. The subassembly is adapted for optically connecting with a ferrule and electrically connecting to a larger computing or communications system. Accordingly, electric resistances and inductances of two spring assemblies coiled in a spiral are reduced to improve electricity transmission characteristic. A process for the production of said rechargeable battery. A double-sided display may be realized by the electronic paper display panel.