10
To determine the nominal watt hours of a battery, multiply the number of cells by the nominal watt hours of the
cells that make up the pack. That is, the number of cells multiplied by their nominal voltage and then by their
nominal capacity.
Eq 2.
Nominal Watt hours of a battery (Wh) = Number of cells x Nominal Watt hours (Wh) of a cell
Determining the Equivalent Lithium Content (ELC) of Cells and Batteries
Equivalent Lithium Content (ELC) of a cell is calculated as 0.3 times the rated capacity of a cell (Ah) with the result
expressed in grams (g). The ELC of a battery is equal to the sum of the grams of ELC contained in the component
cells of the battery.
Eq 3.
ELC of a cell (g) = 0.3 x Nominal Capacity (Ah) of a cell
Eq 4.
ELC of a battery (g) = 0.3 x Nominal Capacity (Ah) of a cell x Number of cells in the battery
Table 3 shows the nominal Wh ratings and ELC for each of the commercially available A123 cells.
Table 3 – Nominal energy and ELC of A123 cells
Cell
Nominal Voltage
Nominal Capacity
Ah Rating
Nominal Energy
Wh
ELC
APR18650
M1-
A
3.3
1.1
3.63
0.33
ANR26650
M1-
B
3.3
2.5
8.25
0.75
AHR32113
M1
Ultra-B
3.3
4.5
14.9
1.35
AMP20
M1
HD-A
3.3
19.5
64
5.85
The following sections give a brief overview of how cells and batteries are classified for transportation and some of
the regulations required to ship a product containing lithium ion cells or batteries both in the US and
internationally.