[ryan_j_naughton]

I don't think you actually learned what their product is. It enables an e-bike owner to much more easily replace their batteries with newer batteries (the issue of mix-and-match seems like a problem with this however). They aren't trying to sell you a single battery that lasts forever. Instead it is an enclosure that enables you to much more easily service your battery / replace batteries.

[out_of_protocol]

Well, article title implies single battery (and not parts of it being replaced regularly) that lasts lifetime. With current technology the only way to achieve that it it to make it explode rather violently. In all seriousness, the issue with that battery's approach is only if it can fit any specific bike, otherwise idea is good since 18650 batteries are highy standardized. except new chemistry right around corner, and new chemistry means different voltages etc

[RockRobotRock]

A battery is just a group of cells. You have to replace one or more of the cells eventually, but it is technically a battery that lasts forever. kind of a ship of theseus situation