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Thanks, I can't believe I've never realized that Wh and J are measuring the same thing!

Just to be clear 1 Wh is not 1 J.

3600J = 1 Wh.

Yes, a J is technically a Ws (watt-second).

Or more accurately, since Joules are the fundamental unit and Watts are a derived unit, a Watt is a J/s (Joule per second)

Damn. Never made that connection. Have a upboat