The 4.25V 21000F Supercapacitor Battery is a high-capacity, long-life energy storage solution designed for emergency lighting systems and critical power backup applications. Featuring ultra-low ESR, rapid 30-minute charge capability, and a wide operating temperature range (-20°C to +65°C), this graphene-based cell ensures reliable performance and safety. Ideal for industrial and renewable energy systems requiring high capacitance and durability.More