The problem is the longer the battery remains within MORE CORROSION will take place as long as there is water within it
The battery can be removed without evidence of being so, therefore out of warranty exchange likely can still take place if it comes to that point.
It is the OP's call, I repair water damage products all the time, at surface component level and it is always best to remove power ASAP
As an example, those that spill onto a apple laptop think they are fine if they remove the main battery, yet many of them forget that there is a PRAM battery also, usually on the underside of the logic board, the current from that alone if wet within will start corrosion making if further more difficult to repair