Medium cells 100F - 700F
Advanced cell types: high performance in a small space
Various categories were defined when ULTRACAP have been introduced. The classification of medium power cells started with capacities above 100F - 400F. Over the years medium size supercapacitors were expanded until they reached a capacity of around 700F. This was achieved by improved carbon and graphene admixtures as well as more modern electrolytes, which were able to achieve larger capacities in almost identical designs. Despite varying heights, the diameters of the cups remained between about 20 and 35mm, resulting in a cost-effective and powerful class due to high standardisation and contacting.
However, limits are set by the ESR, which is difficult to push below 1.5 mΩ while maintaining the cost structure. Better ESR performance is only achieved with the next higher category cells, especially with 60 mm cell technology.