The first thing I would try is disassemble and soak the main and sub boards in 99.9% alcohol. Leave for an hour or so then look for any corrosion and scrub gently with a soft toothbrush. Allow it to dry thoroughly and reassemble. I doubt the battery is damaged.
I have just removed the screen from my Galaxy Book 12. It wasn't too difficult. The attachment method is very similar to a Microsoft Surface Pro 3 or 4 so you could look at some youtube videos of those to give an idea. The screen is only attached with heat sensitive tape. I used a heat gun, razor blades and a plastic pry tool. It would be best to only pry on the top and sides, not the bottom as the join is narrow there and the LCD ribbon cables can easily be damaged, as I did. Didn't matter in my case as the LCD panel is broken. If you can get the top and 2 sides separated then you can just use leverage (and some heat) to separate the bottom. Then detach the LCD and touch cables from the mainboard. It appears to me that the glass digitizer is quite strong but the LCD panel is very fragile. That is the opposite to a Surface Pro where the glass cracks very easily but the LCD usually remains intact. Some photos;