EATON KW and KR series of supercapacitors deliver low ESR for high power density with environmentally friendly materials for a green power solution. Devices are maintenance-free with design lifetimes up to 20-years and operating temperatures down to -40°C and up to +85°C. KR series is available from 0.1F to 1.5F and KW Series from 0.1F to 1.0F, both with a maximum working voltage of 5.5V. Device replace button cell batteries and the battery holder for real-time clock backup power and provide ride through for battery operated devices to allow time for battery replacements. Utilizing electrochemical double layer capacitor (EDLC) construction combined with proprietary materials and processes, devices exhibit high-reliability, high-power, and ultra-high capacitance.