Why Battery rating in Ah (Ampere hour) and not in VA.

• A battery stores charge in the form of chemical energy, which it then transforms into electrical energy to use for a specific amount of time.

• The capacity of a cell or battery, which can be expressed in Ah(Ampere-hour), represents the amount of charge that is currently available.

• Additionally, there are only so many molecules in a charged battery that can generate an electron flow in electric circuits.

•  So, there must be a limited number of electrons in a cell/battery which they motivate through a circuit to fully discharge. 

Now we have the option to rate the battery capacity in number of flowing electrons for a specific time. but, it would be a headache, because there are a vast number of electrons in it.

So we have another option (1C (Coulomb) = 6.25 x 10¹⁸ electrons, or 6,250,000,000,000,000,000 electrons.

1A (Ampere) = 1 coulomb of electrons per second,

1h = 3600 Seconds

Therefore;

1Ah = (1A) x (3600s) = (C/s) x (3600s) = 3600 C.

∴ A (1 Ampere) = 1 Coulomb per second = C/s