Symbol = Meaning
J = joule
kg = kilogram
m = metre
s = second
N = newton
Pa = pascal
W = watt
C = coulomb
V = volt
One joule can also be defined by any of the following:
The work required to move an electric charge of one coulomb through an electrical potential difference of one volt, or one coulomb-volt (C⋅V). This relationship can be used to define the volt.
The work required to produce one watt of power for one second, or one watt-second (W⋅s) (compare kilowatt-hour, which is 3.6 megajoules). This relationship can be used to define the watt. Much of the charging rates and discharge rates in these metal hydrates are expressed in joules. They don't describe how they compare to the EV batteries on the market. I think metal hydrates are faster with less energy to charge and discharge rates that can create great output currents. The rates of these functions are hard for me to estimate. It is the latest technology and I think smarter people will give better answers than I can.