So, turn ur grim into a battery??
That would be an interesting thing to try. However I can see one drawbk right away. If it's drawing in energy there would need to be a way to cap it, that is to say there needs to be a way to control how much gets absorbed. Other wise your basically making a black hole for energy, which of course would be bad(and theroretically could destroy the book).
In general, when you write something or do something, you transfer a little of your energy into that object or act. So in a sense you've already been putting energy into your ink and thus into your book.