Description: The Capattery is a new high-reliability double layer capacitor from Evans Capacitor Company. It is an ideal standby power source in memory back-up and bridge power applications. It has more than twenty times the capacitance density of conventional capacitors, essentially unlimited cycle life, and stable operating performance throughout the -55¡ to +85¡C temperature range. The high capacitance of the Capattery results from an electrostatic charge stored at the interface between activated carbon and an aqueous electrolyte in the so-called electric double layer. Long life is possible because the energy storage is physical rather than chemical in nature and because the component uses an innovative welded package. These features also provide stable performance during extremely high shock loading. The Capattery improves upon previous double layer capacitors because of its patented Permselective valve, which allows the escape of CO2 generated by all double layer capacitors, while it maintains its sealed construction. Being a capacitor, the Capattery requires a very simple charging circuit. It is leakproof, exhibits no memory effect, and can deliver currents from microamps to amps. Unlike most batteries, state of charge can be directly measured. We developed the Capattery to satisfy high reliability requirements. Capable of withstanding exceedingly high shock loads, it is an ideal maintenance-free back-up power source for applications like satellite electronic systems, advanced military equipment and complicated computer networks. Features High energy density, up to 3 joules per cc High reliability, 25 yrs., >1,000,000 cycles Welded, sealed tantalum package Permselective valve No memory effect Resistance to hostile environments Wide temperature range (-55¡C to 85¡C) Applications Memory back-up Bridge power Pulse power Weapons systems