Charging

Many items in GT:NH require Electricity to work. Machines can be connected directly to power generators, but items must be charged in an appropriate GUI. Items will only charge in a machine that matches their desired power tier, which is usually the same tier of battery or circuit used to craft them if not listed. Virtually all single-block GregTech machines can charge by placing items in their power slot (center bottom, lightning bolt icon).

Battery Buffers can charge multiple items at once, not just batteries.