Battery Pack

Lore & Background

In the sprawling industrial landscape of Factorio, the Battery Pack occupies a peculiar niche. It is not a power source in the way a coal generator or nuclear reactor is; rather, it is a *container* for the potential to generate. The Electric Engine Unit at its core is the same component that drives the wheels of a logistic train or the pistons of a mining drill—repackaged here as a dense, self-contained energy cell wrapped in iron and threaded with copper. The design philosophy is elegant: the game asks you to build the entire oil-and-plastic pipeline before you can even *think* about solar power. You must drill, pump, refine, and polymerize before a single panel can be assembled. This forces the player to confront the full weight of their supply chain, turning the Battery Pack into a small monument to the factory's maturity. A player who can produce battery packs in bulk has, by definition, already conquered oil logistics, circuit manufacturing, and gear-wheel grinding. In the broader narrative of the alien invasion that drives the game, these components hint at a world where the player's factory is not merely an economic exercise but a survival infrastructure. Every solar panel powered by a battery pack is another node of autonomy in a landscape where the space age is just beginning and the old grid may not stretch far enough.

In Their Own Story

The assembler hummed its familiar two-beat rhythm, and another Battery Pack slid onto the output belt with a soft metallic clink. Mira watched the stream of them flow past—iron-grey housings, a glint of copper threading through, the Electric Engine Unit visible through the translucent casing like a tiny mechanical heart. Three kilometers east, the solar array was waiting. She'd mapped the site herself: a broad, unbroken stretch of sun-baked plateau where no cable trench would ever be practical. Forty panels. Eighty battery packs. And behind those numbers, a whole chain of assemblers grinding iron, a chemical plant belching plastic fumes into the orange sky, an oil refinery that had been running since before she'd even learned the game's name. She tapped the log console. *Production: steady. Bottleneck: none. Next batch in 40 seconds.*

The sun climbed higher over the factory floor, and the Battery Packs kept coming, one after another, small and patient, waiting to be told where the light would land.

Reader's Guide

To produce Battery Packs, you need an assembler configured with the recipe: 1 Electric Engine Unit, 2 Iron Plates, and 1 Copper Cable. The Electric Engine Unit itself requires 1 Electronic Circuit, 1 Iron Gear Wheel, and 1 Iron Plate. The Electronic Circuit needs 1 Copper Plate and 1 Plastic Bar, and the Plastic Bar is the critical fluid-stage product from a Chemical Plant consuming Petroleum (a byproduct of the Oil Refinery). The full upstream chain is: Iron Ore → Iron Plate → (Iron Gear Wheel + Iron Plate for the engine unit); Copper Ore → Copper Plate → (Copper Cable + Electronic Circuit); Oil → Oil Refinery → Petroleum → Chemical Plant → Plastic Bar → Electronic Circuit → Electric Engine Unit → Battery Pack. Downstream, the Battery Pack feeds directly into Solar Panels (4 Iron Plates + 1 Battery Pack + 1 Copper Cable per panel). No other major recipe consumes it, so your production ratio is straightforward: 1 Battery Pack per Solar Panel. The typical bottleneck is the Plastic Bar stage, because it is the only fluid-handling step in the chain. If your chemical plant is undersized or your petroleum supply is throttled, everything downstream starves. As the factory scales, the assembler count for Electronic Circuits and Electric Engine Units usually outpaces the chemical plant's throughput, so watch that ratio. In practice, players find that a 1:1:1:1 ratio of Oil Refinery : Chemical Plant : Circuit Assembler : Battery Assembler keeps the line balanced, with a small buffer of assemblers on the circuit side to absorb variance.

Did You Know?

• The Electric Engine Unit inside a Battery Pack is the exact same component used to power the electric engines of player vehicles, linking your factory's transport network to its solar infrastructure through a single shar
• You cannot produce a single Battery Pack without first building an Oil Refinery and a Chemical Plant, making solar power one of the most 'full-stack' achievements in the game's progression.
• The Battery Pack is a solid, stackable item with no fluid dependency at its own crafting stage, which means it can be transported by logistic robots or item belts without any pumping infrastructure.
• Because Solar Panels are the only significant consumer, the Battery Pack chain is effectively a 'solar power prerequisite' chain—skip it and you skip solar, but build it and you unlock off-grid generation anywhere on the