User blog comment:DancePowderer/Deus Ex Lacrima/@comment-4449950-20140209112406/@comment-1595565-20140209203234

I have to agree with Nick. The dragon slayer lacrima throws a wrench into your battery idea. A battery doesn't change the physical properties or abilities of those upon which it is used. Those properties and abilities were already present in the system, the battery just allowed them to be usable. This magic in particular relies on the lacrima as a plot device more than any other.