Those are non protected cells.
Ok so I did a little fiddling around and I am not sure how he did that picture. I tried my AW 18350 IMR and they were to long part of the telescope showed so i tried a AW and Tenergy Lipo4 battery and the same thing happened although less was showing. So I pulled the spring completely and still got a hair showing with the Lipo and the 18350 still had a bit showing. So as far as I know either part of the telescope must show or the rethreader ring must be used. Unless he is using a shorter battery then the Lipo4s
Ok so I did a little fiddling around and I am not sure how he did that picture. I tried my AW 18350 IMR and they were to long part of the telescope showed so i tried a AW and Tenergy Lipo4 battery and the same thing happened although less was showing. So I pulled the spring completely and still got a hair showing with the Lipo and the 18350 still had a bit showing. So as far as I know either part of the telescope must show or the rethreader ring must be used. Unless he is using a shorter battery then the Lipo4s