Nope it's in the correct forum.Sorry to hear of your problems.
Admin "MIGHT" move this to the 2019 Sportage (Gen 4) forum, as I understood this to be for the new 5th Gen Sportage, which not yet on sale in UK.
But, yes take it up with your dealer, especially if there has been water infiltration into the battery compartment - it may be BELOW the battery causing unforeseen problems for the future.
Hope you get it resolved satisfactorily - Ensure you are able to see how much and where the water has gone.
Any suspicion that water has ingressed INTO the battery pack and I'd be tempted to reject.