Transcript AA Battery Life Cycle Comparison

AA+ Battery Life Cycle Comparison
STATISTICAL METHODS FOR RELIABILITY ENGINEERING
BRAD ALLARD
OBJECTIVES / SYSTEM DESCRIPTION
• Objective
– To compare life cycle data sets for 3 types of competing brand
name AA+ Alkaline batteries to determine which brand provides
a greater number of watt/hours per dollar.
• Components
Methodologies Used
• 100 Average Watt/Hours Data Points were generated for each of the
battery brands.
• All test results shown below were obtained by running a modified
continuous load test. The resistive load was applied to the battery
until the cutoff voltage was reached (e.g. 0.75 volts). The battery
was then allowed to rest for 15 minutes before the load was
reapplied. This process was repeated until the battery fell below the
cutoff voltage within 5 minutes of reapplying the load, at which time
the test was terminated.
DURACELL
ENERGIZER
SONY
Methodologies Continued…
MINITAB
MAPLE
DURACELL:
ENERGIZER:
SONY:
Results
• Based off of Mean Time to Failure in conjunction
with the price per battery; the Sony AA+ Alkaline
Batteries are the best value.
Conclusions
For a single use, the Sony AA+
Alkaline Battery is a marginally
better value than both Energizer
and Duracell
HOWEVER…
• The current value Analysis does not factor in:
– Recharging Capabilities
• Some batteries may regain a larger percentage of initial life
than others
– Ambient Temperature Power Leakage
• All batteries seep Power over time (especially when stored at
room temperature)
• Some batteries may leak a larger quantity of power in a shorter
amount of time