I think I see the problem.

Lights like this that twist to connect power have zero parasitic drain. When you twist it Off, the battery is not connected at all.

What Zeroair is refering to in his review is a drain due to leaving the charging cable attached. It’s as if the charging circuit does not go to sleep after it’s fully charged.

If you charge it and then remove the plug there will be zero parasitic drain so the light is fine.

If you charge it and don’t remove the plug there will be the drain.

His charging circuit might be defective or it might be it is just designed poorly. There is also the possibility that the 10mA draw he saw on his usb power meter was a draw between the charging circuit and the usb plug. Meaning the charging circuit is not pulling power from the battery at all. This would make it a non-issue.

Unfortunately, you can’t check the actual parasitic drain due to the sealed battery. My guess is it’s zero. I doubt they would design a flashlight that self drained in 24 hours.