When stacking together two full batteries, they display as having zero EU. Separating the stack brings them to full charge again, but it's a weird visual bug.

@AtomicWaffle14 which minecraft version? 1.12?

Edit: Batteries should be only stackable if they are empty and in no other scenario.

Yep, 1.12.2. It seems like a bug then. They stack and display as empty once stacked.

The "Empty part" is right, just the rest is not.

fixed