Try jumping it with some cables or put a charger on it. If it was mine I would jump it from the truck with the truck not running. I have worked on countless bikes and esp. ATVs(I know comparing apples to oranges but...) where they ran crashed and upside down and I have never seen an engine show any internal damage from it. We did replace a lot of ATV batteries. It seemed to us like when they are upside down and getting a charge it kills them quicker than a cheetah. I know I am new here, but I am no fool.