As seen here in the Ragone plot, batteries have higher energy but lower power than supercapacitors, and hybrid supercapacitors are in-between batteries and EDLCs. Then, there are the fuel cells in the upper left corner which are a very good energy source but not a very good power source. The customer can see that batteries fare better at longer discharge times and fuel cells even longer, while supercapacitors are ideal for high-power applications for short periods.