So this idea started off as a solution for the problem with transferring energy from the Nether to the Overworld. Though it also had the side effect of giving us a reason to go hunting into the nether which now i find is actually more important.
It consists of a battery that can hold far more then a lapis battery (5-10x?) but is harder to make as well as only works to it's full potential in the Nether, it still works in the Overworld however it's energy stores deplete rather quickly.
First step is to macerate the Blaze rods into Blaze dust.
Then combine the Blaze dust with a Ghast tear to get Gelatinized Embers.
Throw that into a compressor to flatten it into sheets to get an Ember Plate.
Finally taking some lava and building a vessel for it with Some obsidian as shielding and simple so you can hold it like so:
= Obsidian
= Lava cell or bucket
= Ember plate
You get a Ember Sheathed Plasma Orb which has the odd tendency to start the lava inside spinning faster and faster as you apply electricity to it and even odder then that the effect of the spinning lava within on the Blaze rod and Ghast Tear material causes a very controlled electrical arc whenever it is near Lapis, essentially discharging the rotational energy of the orb. (essentially meaning it will only charge items that use lapis in their construction like MFSUs and Lapis batteries however it can be charged in just about anything)
Essentially you'd have
A) a good way to transfer energy from the nether
B) a reason to go into the nether at all
C) a still balanced item due to the fact that if used in the Overworld it will deplete it's entire energy store within 5-10 minutes