That is mentioned in the article, although could perhaps be more emphasized since it does mean the "obvious" fix is not possible:
Commonly available protected 18650 cells don't fit in the badge's cell holders because they are slightly longer.
That is mentioned in the article, although could perhaps be more emphasized since it does mean the "obvious" fix is not possible:
Commonly available protected 18650 cells don't fit in the badge's cell holders because they are slightly longer.
FWIW, I have battery holders that deathgrip unprotected cells, so even finding a proper holder for those is a crapshoot.
I did indeed totally miss that, thanks for pointing it out!