The 4.25V 21000F Supercapacitor delivers high stability, long life, and ultra-low ESR (1mΩ) for reliable energy storage in marine navigation systems. Featuring a graphene-based design, this high-capacitance cell operates efficiently between -20°C to +65°C, offering rapid 30-minute charge cycles and exceptional safety performance. Ideal for small boat power systems, it ensures uninterrupted operation with customizable color and OEM support.More