Battery Life

Sydney RobertsBAHS

ProblemWhich brand of battery

will last the longest?

Consumer Reports• According to CONSUMER REPORTS in

2007, Energizer came in first as the longest lasting alkaline battery brand above all other battery brands, including Duracell, Ever Ready, and Heavy Duty.

How does a battery work?

Work cited:http://www.explainthatstuff.com/batteries.htmlhttp://www.odec.ca/projects/2006/glaz6j2/battery_info.htm#diagram

Accepts electron

HypothesisEnergizer will last longer than other leading brands.

Experimental Group

• Energizer• Duracell• Ever Ready• Heavy Duty

Experimental Variable• Different battery brands

Control Variable• Flashlight• Computer Program (Logger Pro)• Same light bulb in flashlight• Computer• New batteries• Age of batteries

The Control Group• To be certain that there were no

factors influencing my experiment, I put the batteries in the flashlight without it being turned on. This is my control group.

Control group data

voltage of batterybattery start endEver Ready 3.146 3.146duracell 2.9 2.9energizer 3.24 3.24heavy duty 3.34 3.34

Experimental ProcedureStep One: Gather materials:

–Flashlight.–NEW Batteries- Energizer,

Duracell, Ever Ready, Heavy Duty (all AA)

–LabPro–Computer

Step Two: Allow batteries to sit in room temperature for one hour before the start of the experiment.

Step Three: Put two new energizer batteries (AA) in one flashlight. Make sure the batteries are fresh.

*Attach voltage sensor

Step Four: Connect sensor to the LabPro.Step Five: set-up computer program Logger Pro to

measure the voltage of the batteries for 20 hours for 120 measurements/hour.

Step Six: Turn on flashlightStep Seven: Start the computer to record the voltage.

Step Eight: Repeat the procedure four more times, with a new battery of the same brand, a total of 5 trials.

This is an example of the graphs that I used to collect the data. This graph is collecting the data for energizer, trial one.

Data

Battery Trial 1 trial 2 trial 3 trial 4 trial 5alkaline 5.20 5.10 10.65 5.80 3.20duracell 4.60 4.75 4.70 4.75 5.30energizer 4.85 4.70 4.60 4.70 4.95heavy duty 3.20 1.85 2.90 3.95 4.05

Lifetime of Battery (hr)

Ever Ready

alkaline duracell energizer heavy duty0

1

2

3

4

5

6

7Averages of Battery Life with Standard Deviation

Batteries

Hou

rs

Ever Ready

Averages

Conclusion In this case, my hypothesis does not support

my data. I concluded this because Energizer was not the longest lasting battery brand. Therefore, I reject my hypothesis that Energizer Brand of batteries will last longer than other leading brands.

• If I repeated this experiment again, there would be several things I would do differently. – New flashlight– Test same time of day– I would use more battery brands– I would do more trials

• Some problems I had:– It was difficult to connect the cable to the copper

part of the battery to collect the data.– Not all of my data was accurate because of flaws

in my experiment such as temperature. This may have produced different averages.

Thank you for your time and attention.

I will be happy to answer any questions you have for me at

this time.

THANK YOU!