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I assumed they missed an 'h' there.

People seem to get easily confused by the W/Wh and A/Ah thing. A rental car I've took recently showed power usage in 'kWh per hour'. Bleh.

kWh/h is a proper unit for average energy consumption over time, if a bit weird.

It's something that's used, but I'd make the case it was never proper. The time component is right there!

If you think of watt-hour as "joule times 3600" then it makes sense