Batteries are devices that convert chemical energy into electrical energy.

There are two types of battery:

Disposable Batteries

Disposable batteries are dry batteries that are discarded once there is no electrical energy left.

Alkaline batteries are the most common kind of disposable battery.

They are typically used in devices where power is needed, right away, such as flashlights or smoke alarms.

They can also be stored for a long period of time as they will hold their charge over time.

However, they are damaging to the environment because they cannot be reused and contain chemicals hazardous to human health.




Rechargeable batteries come in two forms:


Wet Cell: These batteries have lead plates submerged in acid.  This causes the chemical reaction which makes electrical energy. 

In a car or a truck, the batteries are recharged by the engine.





Dry Cell: These look like disposable batteries except that they can be recharged.  Typically, rechargeable dry cell batteries are NiMH (Nickel Metal Hydride) or Li-ion (Lithium Ion).

These batteries are recharged using a charger, or solar panels.

NiMH batteries are used in power tools, electric vehicles and two-way radios. They are much cheaper than Li-Ion batteries.

Li-Ion batteries are used in laptops, tablets, smartphones, power tools, cameras and handheld consoles.  In a larger form, they are also used in electric vehicles.

Potatoes, lemons and limes can all be used to create low voltage batteries.  These can be used to power small LEDs or low power devices such as calculators!

How to make a battery from a Lemon!