XPS 15 9560 battery dimensions

Hi. I was on a chat with Dell and the rep and his supervisor told me that current XPS 15 9560 batteries 56Whr and 97Whr are both the same physical size. Therefore, they said, both will permit installation of a 2.5inch drive. I told them that the documentation shows that the 97Whr battery is physically bigger than the 56Whr battery. They claim that they have asked the documentation department to update the user manual to show that both batteries are the same size and will permit installation of a 2.5inch drive. Is this true?

Sorry for the double post. The first one ended up in the video subcategory and I don't know how to delete it.