iPad, battery lithium, UN38.3, which class ?

Hello

I want to organize an expedition of 10 iPad air to Canda.

For this i choose to work with an international transport company which asks me different information about the lithium battery, because it s considered as dangerous stuff.

I read this : iPad: Battery safety certifications, so, i communicate the term UN38.3 to the transport company. But they tell me that they need a class number (apparently between 1 and 9) to be able to make the good package.

Have you got an idea bout this .

Thanks in advance.

Have a nice week end all around the world !

tony