Lithium batteries must have some charge, otherwise they break down chemically. Typically, it's around 40-50% charge, but varies with the exact chemistry of the battery.
And, yes, higher charge means more violent reaction to fire and being punctured for most lithium battery chemistries.
I'm not sure about other chemistries, like NiMH and sodium, that have been used in EVs. But lithium is the most popular.
Bazzite was the distro that got me to kill the Windows 10 install on my gaming machine. Steam Deck catalyzed the move, but Bazzite was the final piece. Steam comes pre-baked in Bazzite, as does your graphics drives, and some multi-store frontends (I forget which atm), and some other quality of life bits. And Jellyfin Media Player is on Flathub, so installs easily via Flatpak.