My Iphone 4S now has a red jack-sensor after a minor splash. How can I tell if it is ruined?

Everething else seems to be OK. However, battery life dropped from 13 to 5 in a short period of time. It's lying on a warm place now.

That Mark is just so that Apple knows that you got water in your phone. They do this so that you can't say that it is their fault.

I would leave it in rice for a few days to let the water get absorbed. Turn it off or the thing is more likely to be wrecked. Then test the thing out. Whatever you do, DO NOT TURN your PHONE ON.

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