How do I batch transfer Pages documents from my iPad?

You do not. No one seems to have any good solution, if you have created dozens of Pages documents on your iPad, which you then want to transfer to your computer.

To transfer one document, mail is probably the easiest solution.

To avoid transferring more than one document, my recommendation is to have only one document. Create one Pages document, add text to it. When you want to write about something else, just tap Return a few times, change style to a new heading or title, and continue typing as if nothing had happened.

(I have not found any way to add a page break in Pages for iPad. If anyone finds out how to do it, feel free to add a comment.)

Once you are ready, transfer that single document and then split it up on you computer according to the logical sections.

Warning! As long documents have a tendency to crash some word processors, make sure you make frequent local backups on the iPad using My Documents > Plus symbol > Duplicate Document.