This might get some flaky feedback, since it likely conjures up images of robey wizards with all-powerful amulets, but come back to earth for a moment just to consider. I was wondering if anyone had any experience with storing energy in an object, so that it can be drawn on when your own is low. Similar to the way some people would pull on trees or people or whatever it is you do, but with this it's your own energy locked into a tangible source.
"Locked" is another important point, actually, because I'm sure you would need to do something to hold the energy there until you needed it, rather than having it naturally flow back to its source (you). Thoughts, comments, suggestions?