Batteries convert chemical energy into electricity through cells containing an electrolyte. Each cell has two electrodes - one releases electrons into the electrolyte while the other absorbs them. When a device is connected to the electrodes, an electrical current flows through it providing power for operation.

1. Batteries convert chemical energy into electricity. Batteries are
made up of one or more separate sections, or cells, containing
a chemical called an electrolyte.
Each cell has two electrically
conductive electrodes immersed into
its electrolyte. The electrodes are
made of different materials; one
releases electrons into the
electrolyte, and the other absorbs
them.
When an electrical device is connected to the electrodes, an
electrical current flows through it and provides electric power
for its operation.