POWER SOURCES

They provide generated electricity (dynamo) or accumulated energy (battery) to the circuit.
Batteries are devices that convert chemical energy into electrical energy. The fundamental structure of a battery consists of two electrodes, metal in most cases, introduced into an electrically conductive solution. Batteries, unlike car batteries, are not rechargeable.
Dynamos convert current into movement.

Read the following article and find out how many batteries are collected per year, what is done with the batteries, where they are deposited and what recycling is.