One of the cooler companies I’ve seen in a while is LumaField, which does industrial CT scanning, as they describe it.
Industrial X-ray CT (Computed Tomography) works on the same basic principle as medical CT, taking hundreds of X-ray images from different angles to capture the internal and external structure of objects in three dimensions.
In addition to providing amazing graphics of these scans, they also gather some valuable data. Their Lumafield Battery Quality Report does a deep dive into lithium ion battery manufacturing, showing the wild differences between different brands.
I love this stuff, whether you call it QA, evals, testing, or whatever, it reminds me of Ray Dalio’s Principle to embrace reality and deal with it.
I just bought a bunch of AA, AAA and 9V batteries. I wonder where Duracell and Energizer get their cells?
I remember a video where a guy had a number of rechargeable batteries that were all about a year old and had been used through that time. He tested each to show how badly degraded the battery was, if it charged or not, or how much charge it had lost.
It’s not always the big brands that have the best batteries.