What happens when an electrical toy does not have a plug? It still needs electricity to work. A battery can help. Batteries store energy. Put a battery in a toy. The toy then gets the electricity it needs to work.

What if you want to use a flashlight outside? The flashlight does not have a plug.
There are no outlets outside. A battery can give it the energy it needs to work.
Many different things use batteries. Batteries let you take electricity with you!