Yeah, I know it's strong, but I was getting 0 damage from lava, even after sitting in it for 30 seconds or more. And sure, the energy might be efficient, but if I can take multiple creeper blasts and 30-50 attacks from monsters and only be down 5% or less.... Well, what's the point in being able to generate so much energy if your equipment uses it so slowly? It seems slow enough that it might be a bug, but I wasn't sure, so I was asking.
I know in the old 1.64 version, it would run out of energy reasonably quickly. It took awhile, but after an extended mining trip of a day or three, it would be out or low, depending on how much fighting/falling you'd been doing. It just seems *vastly* slower to discharge now, which is why I brought it up, since I didn't see any references to that in the change logs.