Would replacing the battery on the iphone 5 fix water damage?

I want to buy a water damaged iphone 5 from someone. He said it was quickly token out but was completely submerged. He said all he tried was a can of air but that's it. Should I take the risk and replace the battery? Would that work? What else could I try? He's selling it for 200

If water got into the electronics it is totally fried. It is worth zero bucks.

No, it will never work right again.

You'll be throwing away $200. Once they're wet, they're garbage.

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