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Presuming post #7 circuit is the final application, I'm rather sure there's a better way to achieve what it does (implement a certain input to vbat voltage transfer function). But instead of guessing about intended function, I prefer to hear a specification first.

Implicite post #1 question seems to be: Is TL431 safe?

My answer, only conditionally, I'd never trust that all conditions are met. Better design an intrinsically safe circuit. Returns to above point, what's the purpose, how can it be achieved in a straight way?