I always wonder if it's worth it for me (30yo) to learn a new trade, like the physics to advance battery research, when I now know a ton about computers and could rather be a dev or sysadmin for a company doing battery research. Probably I need to make that decision soon if I want to make it ever.

I think battery research is more chemistry than physics, but of course there's overlap.

See, that's my current level of expertise in the field!