That's interesting. You're the first person I've seen confirm that this value actually changes. I always thought it was a fixed constant or incorrect OBD2 formula because it never seemed to change. My Niro EV BMS SOC has stayed at 96.5% between new and 10K miles. Hopefully the value is useful for tracking degradation but I'm not sure. Could just be noise in the capacity estimation. Keep on eye on it as you accumulate more miles. Yes. That's how we know the Tesla batteries have no top buffer (ignoring the software limited Standard Range models) while most other EVs do. On my Niro and Bolt, 100% displayed SOC is 4.16V cell voltage. At 100% displayed SOC, the Model 3 cells read 4.20V. They only use a bottom buffer to prevent owners from completely discharging and bricking their car. They do nothing to protect owners who constantly charge to 100% from rapidly degrading their batteries. It's also why visible range/capacity degradation begins as soon as you buy the car (no top buffer to hide it).