Recipes can be learned from books now
Add a craftable item mod that doubles battery capacity of tools

You can learn the "extra battery mod" recipe from "What is a Transistor?" and "Advanced Electronics". Requires Electronics 3+ to learn.
Addictions can be configured in professions.json
Add ability to learn recipes from books, and an extra battery mod for tools that uses it for its construction recipe.
Addictions can be configured in professions.json and move addiction mechanics to dedicated module.
Make addictions in professions optional.