Oh oh, so we can only use very specific batteries specially matched to this device, there are too many 18650 batteries out there that might provide a wrong voltage.
So, guys, tell me: is this more marketing drivel to sell your stash of batteries or do you really not understand that voltage is not the problem with 18650 batteries?
So, what are the temperatures? The temperatures range from 1.8V to 3.7V. Please, make this stop.
It's practically impossible to manufacture a glass chamber? That's certainly somewhat surprising.
Let's see what other little gems of wisdom the video might contain.