Which of the following statements is NOT true?
A
A lead-acid accumulator can deliver a large current because of its very large internal resistance.
B
A secondary cell can be recharged.
C
As a lead-acid accumulator is being charged, the density of the acid in it increases.
D
The chemical action in a primary cell is irreversible.
E
The conventional current in a circuit rlows from the positive to the negative terminal of the battery.