Comment by evelant

Have you considered expanding this idea to more than just ebikes?

For example at least here in the US lithium ion tool batteries come with lots of different connector shapes just to lock users into a brand and are not repairable. Manufacturers charge a lot for the batteries, often more than the tools, and if (when) they go bad they just have to be thrown out. Manufacturers even occasionally "upgrade" their battery designs so that they're not backwards compatible to force purchase of new batteries for newer tools. A universal repairable tool battery would likely be a big hit!

Another use case might be USB power packs. These are all sealed and not repairable. They go bad after awhile and the whole thing is waste when it's most likely just a single cell failing.