Here is another short primer about supercapacitors and batteries
Two of the most common energy storage technologies used for managing peak demand are supercapacitors and batteries. Both have their advantages, but they serve different purposes when it comes to peak shaving. So, which one is better for peak shaving? Let’s explore the differences between...
www.skeletontech.com
BTW, just found this gem of a thread where everyone was discussing claims of 500 Wh/kg battery
FREMONT, Calif. – March 23, 2023 – Amprius Technologies, Inc. is once again raising the bar with the verification of its lithium-ion cell delivering unprecedented energy density of 500 Wh/kg, 1300 Wh/L, resulting in unparalleled run time.
amprius.com
Cautionary tale: 3 years later I don't think they've found their way in any commercial car or motorcycle. Could be a lot of reasons: high price, hard to scale up production, poor longevity, low power density... They're now ailed at drones and light aircrafts. Unclear if they're used in any commercially available vehicle.