[roc]

I don't think you can have such a number, as it hinges so heavily on unknowable future usage and environmental factors.

And frankly now that sudden shutdown isn't a thing, I don't think it matters much. Apple just has to communicate the situation better when processor throttling reaches severe states.

[slantyyz]

Not having an electric car, does anyone know what Teslas, Volts and Leafs do?

Those cars have the extra problem of having batteries out in the cold too.