Batteries

Batteries are not sources of energy Batteries, like hydrogen, are not a source of energy.  They are useful carriers of energy.

The table below shows how much energy (both in watt-hours and in joules) is stored by one kilogram of battery (exclusive of its case) for batteries of various types.

 


Battery Type

Energy Density

W-hr/kg
(watt-hour per kilogram)

Energy Density

J/kg
joules per kilogram
Lead-acid
22
79,200
Nickel-cadmium
(Ni-Cd)
44
158,400
Silver-Zinc
(Ag-Zn)
110
396,000
Sodium-sulfur
(Na-S)
 220
792,000
Lithium-Sulfur
(Li-S)
220
792,000
Iron-titanium hydride
(Fe-Ti-H)
590
2,124,000
Magnesium hydride with Ni catalyst
(Mg-H (Ni))
2300
8,280,000
Gasoline (not a battery!)
(for comparison)
13200
47,500,000

We are grateful to Professor John Tanaka, University of Connecticut, Dep't of Chemistry, for providing this table.

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