I’ve never owned a flip phone that I couldn’t plug in and swap the battery with a new one without it turning off. If that wasn’t normal with your phones I’m not sure why, maybe different circuitry?

Regardless making devices easy to repair, and thus open and maintainable was what I was getting at.

Codeberg / Forgejo and Tangled are my favorite options. Tangled because while it is VC backed, the open source and federated model are well thought out. If you haven’t read the source code I highly recommend it, it’s genius.

Just make hot swapping batteries normal again like it used to be.