Earlier quoted context omitted.
Many rechargeable battery packs are just assemblies of 18650 or similar cylindrical cells — if they just made the packs openable then it would be easy to replace and recycle the cells.
The cells are welded together with contact strips, you need a spot welder to rebuild a pack. Making cells removable isn’t economic, because vibration resistant electrical connections are not cheap.
I disagree. Until relatively recently all battery powered devices had removable batteries, which is why we have standard battery sizes in the first place. Welded and sealed proprietary battery packs are a backward step.