Battery Power

Which battery lasts the longest?


In my project I was trying to find out what battery lasts the longest. I will also try to determine if the cost of the battery has anything to do with the power it has.


I think the Duracell battery will last the longest. I also believe that the more expensive the battery the longer it will last.


paper, wires, stop watch, battery holders, metal connectors, computer, light bulbs, and graph paper. Batteries - Duracell, Everready, Energizer, and BA 30 "Army batteries."

Research/Sources of Information

I researched on how a battery produces electricity. The battery is a dry cell. A chemical reaction between the electrolyte and the zinc electrode helps produce electricity.


  • Electrodes - The negative or positive part of an electric cell.
  • Electrolyte - A liquid or moist substance that conducts electricity.
  • Dry Cell - An electrical cell that has a moist electrolyte.
  • Terminal - The negative or positive end of an electolyte.


I experimented by testing the power of four different brands of batteries. I did this by hooking up the batteries to a light bulb. I then kept track of the length of time each bulb stayed lit. I tested two batteries from each of the four brands.


After the testing was completed the following results were recorded: The Duracell battery lasted the longest, 101 hours and 20 minutes; Energizer battery, second, 99 hours and 17 minutes; Eveready battery, third, 28 hours and 30 minutes, and last but not least was the BA 30 batteries, 25 hours ad 58 minutes.


I thought the Duracell battery would last the longest. I guessed right! It was two hours and 3 minutes longer than the Energizer. I also determined that the cost of the battery does relate to the amount of battery power.


How did I come up with my project idea?

My dad and I were getting ready to go on a boundary waters canoe trip and we were debating on what kind of batteries to purchase for our flashlights. We wanted ones with a lot of power. So I thought that would be a good science fair experiment.

What did I learn from my experiment?

I learned that science fair projects are a lot of hard work. The most powerful battery of the four I tested was Duracell. It also was the most expensive.

How close were my hypothesis and conclusion?

I guessed that Duracell would last the longest and I was right. It was also the most expensive.

Did I learn anything new from my project?

Yes I learned through this experiment that if you buy a more expensive battery you get a more powerful battery.

What was the most interesting part of my project?

It was when my hypothesis and conclusion matched.

Select the kit you need for your project

Standard Kit

This picture shows a circuit assembled using the Standard battery life test kit of

As you see you can use it to test up to 4 small (AA size) batteries at the same time.


Basic Kit

This picture shows a circuit assembled from the BASIC battery life test kit of

As you see you can use it to test only one large (D size) battery. So you will need more than one of this if you need to test multiple batteries at the same time.


Order a kit for battery life test kit

Materials for this project are available in the form of a kit you can order here.


Disclaimer: The description in this sample project is sent to us just as a project sample performed by a student. We have not verified the correctness or accuracy of the information. It is being provided here AS IS. The battery life test kit of comes with its own online instructions.

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