Difference between battery power density and energy density

What is the difference between the battery power density and energy density ?

Is it the same ?

Battery power density doesn't mean the same as battery energy density. These two parameters may look similar, but they are quite different.

Energy density means how much energy can the battery store. The amount of energy that battery can store, can be expressed per:

• Volume - Watt-hours per meter square - Wh/m³, Watt-hours per liter - Wh/L
• Mass - Watt-hours per kilogram - Wh/Kg

Power density means how fast the battery can deliver energy. It can be expressed per:

• Volume - Watts per meter square - W/m³, Watts per liter - W/L
• Mass - Watts per kilogram - W/Kg