Why are redox reactions used in batteries?
the attraction between charged ions releases energy.
the movement of electrons creates an electric current.
the reactions are extremely exothermic, producing an electric current.
the reactions are extremely endothermic, inducing the movement of electrons.

The movement of electrons creates an electric current.

Explanation:

Batteries are electrochemical cells which are devices in which chemical reactions produce an electric current, that is, devices for converting chemical energy into electrical energy.

The reactions involved here are spontaneous redox reactions hence an electric current flows on its own in the external circuit.

In such reactions, there is an electronic movement which creates a potential difference between the two electrodes thereby generating a flow of an electric current in the external circuit. The current flows in the opposite direction to the electronic movement due to chemical reactions.

The flow of the electric current results in an the production of electrical energy while the electronic movement instigates a chemical energy.