\text{Wh/kg}

watt-hour per kilogram

Specific energy Specific latent heatexact by definition

One watt-hour per kilogram, equal to 3600 J/kg. It is the unit battery cells and packs are specified in — a good lithium-ion cell runs 250 to 300 Wh/kg, and a complete pack rather less once the case, cooling and management are counted.

Watch out: Cell figures and pack figures are both quoted in Wh/kg and are not the same number — a pack typically lands 20 to 40 percent below its cells. A specification that does not say which it means is not a specification.

1 $\text{Wh/kg}$ (Specific energy)	3,600 $\text{J/kg}$
1 $\text{W}{\cdot}\text{h/kg}$ (Specific latent heat)	3,600 $\text{J/kg}$

As a unit of specific latent heat

The watt-hour per kilogram is exactly 3600 J/kg, the standard unit of battery specific energy. A lead-acid cell is about 35 W·h/kg, a lithium iron phosphate cell 90 to 160, and a high-nickel lithium-ion cell 250 to 300.

One watt-hour per kilogram in every specific energy unit

3,600	joule per kilogram (J/kg)
3.6	kilojoule per kilogram (kJ/kg)
0.0036	megajoule per kilogram (MJ/kg)
1	watt-hour per kilogram (Wh/kg)this unit
0.001	kilowatt-hour per kilogram (kWh/kg)
1	kilowatt-hour per tonne (kWh/t)
1.54772	BTU per pound (BTU/lb)
0.907185	kilowatt-hour per short ton (kWh/ton)

One watt-hour per kilogram in every specific latent heat unit

3,600	joule per kilogram (J/kg)
1,204.39	foot pound-force per pound (ft·lbf/lb)
3.6	kilojoule per kilogram (kJ/kg)
3.6	joule per gram (J/g)
1.54772	BTU per pound (BTU/lb)
1	watt-hour per kilogram (W·h/kg)this unit
0.860421	calorie per gram (cal/g)
0.860421	kilocalorie per kilogram (kcal/kg)
0.0036	megajoule per kilogram (MJ/kg)
0.001	kilowatt-hour per kilogram (kW·h/kg)

Solvers that use specific energy

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