Here’s one reason Tesla recommends 80% charging

This charging session is not Supercharging. As battery level approaches ~80%, the current starts to decrease, so charging speed goes down.

Even so, the battery module temperature keeps rising continuously and exceeds 50 °C over about 10 minutes. In other words, temperature increases despite lower charging power, mainly at high battery level.

This is one practical reason Tesla recommends daily charging up to around 80%. It’s not only about fast charging, but about reducing time spent at high SOC and elevated temperature, where thermal stress and aging accelerate.