Iron Plate to Battery Chain

Lore & Background

In the sprawling industrial landscape of the alien world, iron and copper veins dot the terrain in rich, easily visible deposits. Early on, the player's hands are busy hauling ore by the bucket, feeding it into a single stone furnace, and watching the satisfying clink of plates drop into the output slot. But the moment the first battery recipe appears on the research screen, the game's rhythm shifts from simple extraction to choreography. The battery itself is a small, unassuming component—yet it represents the moment the factory stops being a collection of isolated machines and becomes a system. The iron gear wheel, with its interlocking teeth, is the mechanical heart; the copper cable, thin and gleaming, is the nervous system. Together they form a cell that stores and delivers the electrical energy the alien world's technology demands. Without batteries, the player is stuck with slow stone furnaces and a single, fragile power line. With them, the factory can breathe, expand, and eventually reach for the sky. Fans often describe the first time they balance this chain—counting furnace outputs against assembling-machine inputs, watching the 5:1 ratio click into place—as a quiet, almost meditative triumph. It is the moment the player stops being a miner and starts being an engineer.

In Their Own Story

The night shift at the outpost was quiet. Dust motes drifted through the amber glow of a single electric lamp, and the only sound was the low, rhythmic thump of the assembling machine cycling through its work. Mara leaned against the cold metal of the furnace housing, watching the conveyor belt carry copper cables toward the final station. Each one a thin, coppery thread, each one a small victory over the chaos of the last three days when the gear-wheel line had clogged and the whole chain had ground to a halt. She pulled a battery from the output slot, held it up to the light. Dense, compact, humming faintly with stored charge. Enough for one more electric pole. Enough to push the power grid another hundred meters toward the copper deposit she'd spotted on the eastern ridge. She slotted it into her belt, turned back to the machine, and fed it the next gear wheel. The factory would grow. It always did. But tonight, for a few minutes, it was just her, the hum, and the slow, patient work of making the impossible into the routine.

Reader's Guide

The chain has three stages. Stage 1 (smelting): Iron ore → Iron Plate and Copper ore → Copper Plate, both in a Furnace (stone, steel, or electric). Stage 2 (intermediate assembly): 2 Iron Plates → 1 Iron Gear Wheel, and 1 Iron Plate + 1 Copper Plate → 2 Copper Cables, both in an Assembling Machine. Stage 3 (final assembly): 1 Iron Gear Wheel + 1 Copper Cable → 1 Battery, in an Assembling Machine. The optimal input ratio per battery is 2.5 iron plates and 0.5 copper plates, giving a 5:1 iron-to-copper plate ratio. In practice this means for every copper furnace you run, you need roughly five iron furnaces (or equivalent throughput). The iron plate stage is almost always the bottleneck, since it feeds both the gear-wheel and cable sub-chains. As the factory scales, upgrade furnaces to steel and then electric to increase smelting speed, and add more Assembling Machines to keep the gear, cable, and battery stations fed. The ratio never changes—only the throughput per machine does—so the 5:1 balance must be maintained at every tier. Players who neglect copper early on will find their battery line starved of cable, while those who over-build copper will see idle furnaces and wasted energy.

Did You Know?

• The 5:1 iron-to-copper plate ratio means a player must produce five times as many iron plates as copper plates to keep the battery line fed, making iron smelting the perennial bottleneck.
• Batteries are a prerequisite for both electric furnaces and electric poles, meaning the chain indirectly gates the player's ability to speed up the very iron and copper smelting it depends on.
• The copper cable recipe yields two cables from one iron plate and one copper plate, which is why the per-battery copper demand is only 0.5 plates rather than a full one.
• In early Factorio updates, the battery recipe and its component requirements have remained stable, making this one of the most consistent chains across the game's history.