JFTR: achieving that capacity retention is a question of charge settings. Pretty much any Lithium ion battery can achieve it if you don't charge it to the absolute maximum possible each time.

It's quite simple. While you can charge a "good old" Lithium ion battery to 4.2V, you already start getting slow degradation at that point. Charging it to 4.1V or 4.05V massively reduces that. But at the same time, those 100 or 150mV are a notable amount of charge, up to 20%. So… yeah. It's a tradeoff.

For reference: https://nenpower.com/blog/how-does-charging-voltage-impact-t...

https://e2e.ti.com/cfs-file/__key/communityserver-discussion... page 15

If the bill defines a charge cycle as 100->0->100 then the restriction should be more meaningful right? Manufacturers would have to ship a larger battery and cap its capacity to get the same lifespan.