Suggested by iKnowledge Sebastian Shaw is a tough fighter who absorbs kinetic energy. If Batman only had his normal form then I think it’s very safe to say that he would lose this battle. I don’t think the gadgets would be enough to stop him. Batman has obtained tons of super forms over the years though that really give him a way to fight back like when he got Superman’s powers. Shaw’s not going to be able to stop him and will ultimately go down here. Batman wins.
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If Sebastian Shaw can use all he has: https://marvel.fandom.com/wiki/Sebastian_Shaw_(Earth-616)#Powers_and_Abilities, then regular Batman is defeated. If Batman truly gets all his powers and gadgets at their highest, then he has a chance. It would be a battle for the century.
I agree, regular Batman would lose this fight. He just doesn’t have anything that could put Shaw down