First of all, I'd like to say that I acknowledge the overpoweredness of this mod. Don't hate about it. If you don't want minecraft to be easy, then don't download it. That's it.
A little more basic but still useful, the tool charger is a block with a single inventory space that can charge tools, like the title implies. It also works on some mods, as long as the damage on the tool is a regular durability. I tried to make the block somewhat balanced with an expensive recipe:
Here's what the block looks like in-game:
