WI: Napoleon defeated at Hanau

Napoleon was able to defeat a Bavarian-Austrian army that was well over double the size of his army, being in his way of retreating to France, after his failure at Leipzig. If he is defeated here, what would the Coalitions terms be if they had the French monarch in their hands or if he was able to escape, is the French Empire done for?

https://en.wikipedia.org/wiki/Battle_of_Hanau
 
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