The 4.25V 21000F Supercapacitor is a high-power energy storage solution designed for electric bicycles and other high-demand applications. Featuring ultra-high capacitance, rapid charge/discharge, and long lifecycle performance, this graphene-based supercapacitor delivers reliable power in extreme temperatures (-20°C to +65°C). With low ESR, customizable color options, and safety-certified construction (RoHS/CE/ISO9000), it's ideal for sustainable energy systems, regenerative braking, and peak load management in renewable energy and EV sectors.More