Knoppix :) I was just a wee boy using it to analyze malware safely on a Windows machine. The idea we were booting an OS and running it live off a 1GB USB stick blew my bosses mind. Didn't use Linux seriously at all for another 5 years, now with the rise of Proton I'm all in on PopOS 😎
I honestly never got this. 1.5 hours charge brand new, 3-5 years all those cycles it will go through, and the manufacturer does not replace the batteries nor are they user replaceable. So it just becomes a normal mug, borderline e-waste. Not for me...