I would have to echo the review from two disappointed children! I was also sucked in by the toys r us marketing that suggested the 9.6 volt battery. We live in the Northeast and had a great snow storm last night and were all set to use the terrain twister for our son while we shoveled today and low and behold the battery isn't the right one. It wasn't cheap for the 9.6 volt and now we have to purchase (first find) the flex pack battery. I don't know if it was Tyco or Toys R Us that thought up this marketing scheme but it was a good one! The reason my review is all 1 star is because we haven't been able to try it out!!!!!!!!!!!