[PunchyHamster]

Phones would be hard because manufacturers want to fill every square mm of it, but we can start with power tools batteries...

[rootusrootus]

Power tools have lots of empty space in the battery case already, and most just use 18650s. We could mandate making the cells directly reachable.

Phones are definitely a more difficult use case.

[throwawaymobule]

Some manufacturers in the industry are already standardising on one or two designs since a few years ago.