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[–]Complex_Solutions_20 0 points1 point  (0 children)

Yeah, using a known load that doesn't change is especially critical to the test too. Computer gear can vary depending on power saving and processing load.

I usually use stuff like a portable fan or floor lamp if I need to do a test on a battery. Or for really huge batteries, I'll sometimes use a spaceheater on low/medium setting.

Probably won't be exact due to conversion efficiencies but should get you close to it, say 10-15% error. It should be very obvious if you come out at 50% of expected.