Some laptop manufacturers disable functions and stay in low performance throttle if there is no battery present, and remain that way until a new one is installed. Apple does this.
Some laptop manufacturers disable features if their operating system is not installed. Apple disables integrated Intel graphics, for example, and forces amd graphics on Linux and OpenBSD.
So its not impossible that your laptop is crippled by design without the battery.
Honestly, fuck Bandcamp. I used that platform for years, purchased a huge library, supported artists even when I was about 90% sure that some of them were just resellers providing rips of the original artists music.
And then for no reason at all a few weeks ago, I was asked to verify my account via email. Despite using the correct autosaved password. That email never arrived. Never arrives no matter what I try. So I cannot get back in. Support is like check your spam folder like motherfucker you don’t think that’s the first place I went when I didn’t see the conformation email?
Fuck the new ownership. Fuck Bandcamp. Good luck with your upcoming job search.