it will show buyers information about the vehicle’s battery, such as its composition, where its materials are from, its recycled content, and its carbon footprint.
Also
they will track the state of the vehicle’s battery health over time as the vehicle is charged and discharged. […] Future customers will be able to learn much more about the vehicle they’re buying from battery passports.
I respect the first part, but it seems like a niche audience that would care about materials sourcing. The battery health history is interesting. Service logs are one thing, but real data to show how hard it's been charged and driven is cool.
You can do this already with https://recurrentauto.com at least with showing battery health. It also tracks my state of charge and you can tell that I just got done with a long trip where I used the whole battery 100-10 as opposed to my normal 80-30%
I'll value a used car using recurrent more than one without
Like all BMS track this data. Every EV has a BMS. Most apps let you access this data. It's up to the EV maker to block this data from EV owners.
This is a great step in the right direction but doesn't change the beauty of buying used EVs vs ICE. App on phone and OBD scanner. Don't need a mechanic inspection.