HB 2.5V Supercapacitors PowerStor / Eaton HB 2.5V Supercapacitors are high-reliability, high-power, ultra-high capacitance energy storage devices utilizing electrochemical double-layer capacitor (EDLC) construction. The capacitors feature low ESR for high power density with environmentally friendly materials for a Green power solution. The series has a capacitance range of 3.0F to 110F, a maximum working voltage of 2.5V, and a temperature range of -25°C to +85°C. PowerStor / Eaton HB 2.5V Supercapacitors are ideal for backup power, pulse power, and hybrid power systems.