66% of cordless mowers overstate runtime by an avg of 34% (Audit of 178 models) (winnowl.com)

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Manufacturers test their products under conditions that overstate real-world performance? Shit, my faith in capitalism is shattered!

I also overstate runtime when I am using my reel mower.

I just assume that about any battery powered product. Any claims are achieved in unrealistic perfect conditions, so you know the real number will be 30-40% lower. Even Apple does it.

There's simply no standard for testing. They can basically apply whatever "load" they want to calculate the runtime.