It depends what sort of battery it is.
emit heat emit light start a chemical reaction like say burning someone charge a substance with energy like a battery move something by turning to kinetic energy ... that's it for me :)
Atoms emit energy as light when electrons move to a lower energy level
The atom will emit some sort of electromagnetic radiation. It can range from x-rays to visible light depending on which energy levels are involved
solar energy.
Black holes emit a great deal of x-ray energy.
Yes, a a battery will emit the fumes from the Sulfuric acid which is extremely toxic.
The circuit needs some sort of energy source. This can be a battery/cell, or an AC outlet for example.
They contain chemical energy. If you are charging a battery, it has electric energy.
Yes.
to send out bruv
No, it is not.