Edit: I am talking about EVs
In: Physics
Different standards of different industries.
Batteries, for the most part, tend to care more about amperage ratings than the actual amount of power involved, so everything ends up being rated in amps (and in related terms, like amp-hours) than in watts or watt-hours.
However, the automotive industry measures engine and powertrain components based on power, and so they use power-based units for rating capacity. That means using watts and watt-hours.
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