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The most reliable way to build an efficient battery farm in Arknights: Endfield is to unlock Basic AIC II, choose the highest battery tier your material supply can support, connect every input and output to the PAC, and distribute the batteries across multiple Thermal Banks. A Thermal Bank consumes one battery every 40 seconds, or 1.5 batteries per minute—not one battery per minute.
What you need before building a battery farm
Battery production and Thermal Banks are not available immediately. Complete the main mission Chapter 1 Process II: Paving the Way and provide a Basic Expansion Core to unlock Basic AIC II. Then research Thermal Bank under Basic AIC II in the Basic AIC Plan.
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Basic AIC II also unlocks the Splitter, which is essential when one battery line feeds several Thermal Banks. For the in-game tutorial, open Operation Manual, select Simulation, and then choose Valley IV.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Before Basic AIC II, the initial power limit is 200. If your early factory exceeds that limit, remove or disable facilities until total usage is no more than 200. You need startup power because battery-production facilities consume power themselves.
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How the battery chain works
A battery farm is a production chain, not a mined power source. A standard setup uses three stages:
- Shredding Units: process Originium Ore into Originium Powder.
- Material processing: convert the valley-specific ore into the required intermediate material and parts.
- Packaging Unit: combines the intermediates into batteries.
The finished battery must then travel through belts to the Thermal Banks. The entire chain must have working resource inputs, facility power, item belts, and a valid PAC connection.
Battery tiers and Thermal Bank output
| Fuel | Power output |
|---|---|
| Originium Ore | 50 |
| LC Valley Battery | 220 |
| SC Valley Battery | 420 |
| HC Valley Battery | 1,100 |
One Thermal Bank consumes one battery every 40 seconds. Therefore:
- One Thermal Bank needs 1.5 batteries per minute.
- A 6-battery-per-minute line can supply four Thermal Banks exactly.
- Sending the entire line into one Thermal Bank only creates a surplus; it does not make that bank produce power faster.
Use a Splitter to divide one belt into up to three paths, then route the output to multiple Thermal Banks. If you need more than three branches, split one of the resulting paths again.
Connecting Thermal Banks correctly
- Place the Thermal Bank so it follows the PAC’s arrow direction.
- Connect it to the PAC with a Transport Belt.
- Check for the game’s white connection glow. No glow means the connection is not valid.
- Feed Originium Ore or batteries into the Thermal Bank through the PAC output port.
Keep the battery line’s production power requirement in your calculations. A farm is not automatically self-powered: its machines consume electricity while they manufacture batteries. If the production line loses power, battery output stops; the Thermal Banks then consume their stored fuel and eventually shut down the factory.
Which battery farm should you build?
LC Valley Battery: the practical early setup
LC Valley Batteries use Amethyst-based inputs. The published LC layout produces 6 batteries per minute, enough for four Thermal Banks, with a published production power requirement of 55 and maximum generation of 880 from those four banks.
Blueprint codes:
- Asia:
EFO01ouiI5eoea6o2IieO - US/EU:
EFO01Eu233u1uio5O3uIa
Use this option when Amethyst inputs are readily available and you want a straightforward battery-to-power expansion. After Ferrium Ore becomes available, you can move to an SC line. The LC line can reportedly be adapted by replacing Amethyst Ore with Ferrium Ore, but the published guide notes lower efficiency than using a dedicated SC setup.
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SC Valley Battery: the stronger mid-tier option
SC Valley Batteries use Ferrium-based inputs. The published layout also produces 6 batteries per minute, but each battery provides 420 power. Four Thermal Banks therefore have a published maximum generation of 1,680. The battery line itself has a published power requirement of 90.
Blueprint codes:
- Asia:
EFO01a651oOaOeAU1oe5e - US/EU:
EFO012I4uuIaIe85OeIOo
Switch to SC production once your Ferrium supply and other prerequisites are stable. Do not choose it solely because the output number is higher: the correct choice depends on whether the factory can continuously supply every input without starving.
HC Valley Battery: highest output, more demanding logistics
HC Valley Batteries provide 1,100 power each, but their production chain is more complex and requires Sandleaf. The basic published HC setup makes 2 batteries per minute, supplies one Thermal Bank, and has a published production power requirement of 135.
Basic HC blueprint codes:
- Asia:
EFO01O4a5e0O08Iou9oe4 - US/EU:
EFO0172UEE2I2155aO0Ai
The source describes a Sandleaf setup in which one Sandleaf is placed into a Seed-Picking Unit to begin an effectively self-multiplying supply. Confirm that the Sandleaf chain is actually producing before expanding the battery side.
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A separate high-efficiency HC layout produces 6 batteries per minute. It generates 3,300 power through three Thermal Banks, or up to 4,400 through four, and sends enough surplus batteries to the depot to support one additional Thermal Bank.
High-efficiency HC blueprint codes:
- Asia:
EFO01iUIa7I1iI2e472U4 - US/EU:
EFO01o08aa0U0263UIieO
HC is not automatically the most efficient farm in every situation. Its higher output per battery comes with more demanding inputs, and the basic published layout is only 2 batteries per minute. Choose it when the full resource chain is dependable, not merely because it is the highest tier.
Wuling battery layouts
Wuling battery layouts can produce substantially more power but require additional materials and, in some cases, water logistics.
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LC Wuling Battery
The minimal LC Wuling layout produces 2 per minute and has a published maximum generation of 1,600 for one Thermal Bank. It requires a separate Xiranite production line.
- Asia:
EFO01u8U4oU2uU0a7AoOU - US/EU:
EFO01U4A224o4aO27Oa8
The high-efficiency version produces 6 per minute and has a published maximum generation of 6,400 for four Thermal Banks. It uses a Depot Bus and still requires a separate Xiranite line. Xiranite production needs water, so connect the required pipes manually after placing the layout.
- Asia:
EFO01A7u1eu6AuEo9ieO - US/EU:
EFO0172UEE2I21588O0Ai
SC Wuling Battery
The basic SC Wuling layout produces one unit every 40 seconds and has a published maximum generation of 3,200 for one Thermal Bank. It requires Dense Originium Powder and Xircon.
Its Cuprium process uses water and creates Sewage. If Cuprium storage reaches capacity, Sewage production stops and the battery chain halts. Inert Xircon Effluent has no current in-game use according to the retrieved guide and may be disposed of with a Water Treatment Unit.
- Asia:
EFO01A7u1eu6AuEo9ieO - US/EU:
EFO016i1AAiOi87UeO83e
How to import a shared battery blueprint
Blueprint sharing becomes available during Process II, Paving the Way. Players who have not unlocked that system cannot import or use shared blueprints.
- Open the in-game blueprint screen.
- Under Shared Blueprints, choose Import.
- Enter the alphanumeric share code for your region.
- Review the preview and choose Save.
- Select the saved blueprint and choose Apply Blueprint.
The available categories include System Blueprints and Owned Blueprints. The documented sources do not provide a verified top-level controller or keyboard route to the blueprint screen, so use the current in-game interface rather than relying on an assumed menu path.
Use the Asia code on an Asia service region and the US/EU code on a US/EU region where separate codes are provided. Blueprint codes are not universally interchangeable.
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What to check after applying a blueprint
A blueprint saves a layout, not necessarily a complete working factory. After placement, inspect every boundary:
- Connect raw-material belts to the PAC.
- Connect the finished battery output to the PAC and Thermal Banks.
- Add depots, unloaders, or other edge logistics if they fall outside the saved footprint.
- Connect water pipes for Xiranite and other water-dependent chains.
- Confirm that the required research, facilities, upgrades, and buildable area are available.
- Check that the external Amethyst, Ferrium, HC, Sandleaf, Xiranite, Dense Originium Powder, or Xircon lines are actually producing.
The game blocks a blueprint when its research or facility requirements are missing. If it places successfully but does not run, the cause is usually a missing connection, missing external input, unavailable upgrade, insufficient area, or a facility that is not powered.
Battery-farm troubleshooting
The line produces no batteries
Trace the chain backward from the Packaging Unit. Look for missing Originium Powder, depleted Sandleaf, absent Ferrium or Amethyst, a disconnected external production line, or a belt that does not reach the PAC.
The Thermal Bank is empty or disconnected
Check the PAC arrow alignment, add or repair the Transport Belt, and look for the white connection glow. Then confirm that batteries are reaching the PAC output port and that a Splitter is not routing them away from the bank.
The farm shuts down after running for a while
Check for a power cascade. The battery machines consume power, so an unstable factory can stop producing its own fuel. Reduce other facility usage, provide enough startup power, and make sure the farm’s net output is positive before adding more Thermal Banks.
A Wuling line stops after import
Reconnect its water pipes and inspect storage. On the SC Wuling line, full Cuprium storage stops Sewage production and can halt the battery chain. Add the required waste handling and prevent the relevant storage from remaining full.
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Batteries are not exclusively Thermal Bank fuel. They can also be stored for Outpost Trading and used to operate certain combat facilities without an Electric Pylon. That makes surplus production potentially useful, but do not mistake excess batteries in storage for efficient power generation: Thermal Banks still consume fuel at their fixed rate.
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