Water damaged and now it dies instanlty if I disconnect the charger.

It works fine with power cable connected and it glows orange but does not charge.

Battery stuck at 63% all the time.

Battery contidion says: Replace now.

So the question is will a battery replacment work or is the board damaged?

Update (04/23/2020)

Forgot to mention have tried restting SMC, PRAM.

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You could try opening the laptop and reseating the battery connector. Look carefully for water damage marks around it

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