What is a Battery?
Answer:
A battery is a self-contained unit that transforms chemical energy into electrical energy.
Every battery contains at least one cell, which is divided into two parts. Each half cell is filled with a chemical that will react with the chemical stored in the other half cell. This electrochemical reaction will begin once the two terminals are connected by a wire or some other conductive material.

Primary batteries, like the AAA, AA, C, or D batteries, have a limited life span that can be considered "one-time use." In other words, once the chemicals have started reacting they begin to be used up and when they're gone, they are gone. These are common in devices that require little power (such as an alarm clock).

Secondary batteries like a cell phone battery or car battery, can be recharged by reversing the chemical reaction. These are common in devices that use a lot of power and where replacing batteries would be impractical.
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