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Energy
Density
Energy density is a measure of available energy in terms of
weight and volume. It is the ratio of a cell’s capacity
to either its volume or weight and can be used to evaluate a
cell’s performance.
The following table provides a summary of the major alkaline
product types comparing both volumetric energy density and gravimetric
energy density. Volumetric energy density is an important factor
where battery size is the primary design consideration. Gravimetric
energy density becomes important where weight of the battery
is critical, such as in portable computers and cellular phones.
The values shown in this table are typical for each cell size.
Actual energy output will vary, dependent mostly on drain rates
applied.
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ALKALINE
MANGANESE DIOXIDE PRODUCT SPECIFICATION SUMMARY
Click here for
product specification summary
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To determine the practical energy density of a cell under specific
conditions of load and temperature, multiply the ampere-hour
capacity that the cell delivers under those conditions by the
average discharge voltage, and divide by cell volume or weight.
|
| Gravimetric
Energy Density: |
(Drain
in Amperes x Service Hours)
x Average Discharge Voltage |
= |
Watt-Hours |
| --------------------------------------------------- |
-------------------------- |
| Weight
of Cell in Pounds or Kilograms |
Pound
or Kilogram |
| Volumetric
Energy Density: |
(Drain
in Amperes x Service Hours)
x Average Discharge Voltage |
= |
Watt-Hours |
| --------------------------------------------------- |
-------------------------- |
| Volume
of cell in Cubic Inches or Liters |
Cubic
Inch or Liter |
Using
the MN13OO data from the table above, the previous equations
can be used to determine energy density for this cell.
|
| Gravimetric
Energy Density: |
| 15.00
Ampere-Hours x 1.2 Volts |
= |
59.2 Watt-Hours |
or |
130.4
Watt-Hours |
| ---------------------------------------------- |
------------------------ |
------------------------- |
| 0.304
Pounds (0.138 Kilograms) |
Pound |
Kilogram |
| Volumetric
Energy Density: |
| 15.00
Ampere-Hours x 1.2 Volts |
= |
5.23
Watt-Hours |
or |
320
Watt-Hours |
| ---------------------------------------------- |
------------------------ |
------------------------- |
| 3.44
Cubic Inches (0.0563 Liters) |
Cubic
Inch |
Liter |
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