This question has some controversy on how to charge a Power Tool from the Modular Powersuits mod. While it is commonly known that both EU, MJ, and UE can be used to charge it, I want to know how something can be charged with MJ.
Unlike a Batbox/MFE/MFSU/AESU/IDSU which has a slot in its GUI to charge stuff with, Redstone Energy Cells and whatever engines do not have a slot to do this.
IndustrialCraft has the Charge Pads addon, which charges stuff with EU while a player stands on it. BuildCraft/Thermal Expansion/RailCraft... do not have anything of the sort.
So, how can you charge items with MJ?