Battery Power - Which Battery Lasts Longest?
Introduction
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.
Hypothesis
I think the Duracell battery will last the longest. I also believe that the more expensive the battery the longer it will last.
Materials
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.
Vocabulary
- 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 electrolyte.
Experiment
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.
Results
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.
Conclusion
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.
Optional
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.
Order a kit for battery life test
This kit is also for a simple electric circuit you will use in this project.
Frequently Asked Questions
What type of light bulb should I use for battery testing?
Use a low-voltage flashlight bulb (typically 1.5V to 3V) that matches your battery configuration. The bulb should draw a consistent, measurable current to provide accurate test results.
How do I ensure accurate timing in my battery test?
Set up your test in a location where the bulb can be monitored regularly. Use a reliable stopwatch or timer, and check the bulb at consistent intervals (every few hours). Record the exact time when the bulb becomes too dim to be useful.
Can I test rechargeable batteries with this method?
Yes, but keep in mind that rechargeable batteries (NiMH, NiCd, Li-ion) have different voltage characteristics than alkaline batteries. Test them separately and note that their performance curves differ significantly from disposable batteries.
Why do some expensive batteries last longer?
Premium batteries often use higher-quality materials, better electrolyte formulations, and improved manufacturing processes. This results in more efficient chemical reactions and longer-lasting power output.