Eldritch Empowerment + Eldritch Battery not working

The first line on Eldritch Empowerment states: "Non-Channelling Spells cost an additional 3% of maximum Energy Shield"

First line on Eldritch Battery says: "Converts all Energy Shield to Mana"

What I'm expecting:
- Clicking Eldritch Battery puts you at 0 Energy Shield
- 3% of 0 is 0, so no ES cost to spells is added when you click Eldritch Empowerment

What actually happens:


Spells cost 1 ES, I have forced 0 from EB and thus successfully disabled myself.

Having Eldrtich Empowerment when you have no Energy Shield doesn't work either. I thought I'd remove the ES cost by not having any, but it blacks out my abilities.
So 3% of 0 > 0.

BUMP. Still either bugged or not properly described.