One of the reasons I will always prefer print books to e-readers.
Having nothing to read while eating breakfast is a poor way to start a Saturday of more homeworking. :c
I’m not familiar with the Kobo, but Kindles and Nooks let you read while recharging. As long as you haven’t lost your charging cord, you should be golden.
Not that I’m saying that an ereader is always the right choice. For instance, if a book has pictures, charts or maps, I’d rather see the paper copy. Also, sometimes pictures and charts simply aren’t available in the ereader format. The Kindle edition of Physics for Future Presidents is an example of this problem.