User blog comment:DancePowderer/Deus Ex Lacrima/@comment-4449950-20140209112406/@comment-7418318-20140209120608

But Dragon Slayer Lacrima don't just provide raw magic power, but enable the use of magic that the mage couldn't do otherwise. And they also cause physical changes to the body, like the motion sickness and stuff.

And I wouldn't call something that combines the power from four different magic sources and combines it into one stream a battery.