Battery Cells

Battery Cells are rechargeable Gear that store FE. You install them in a machine's Gear tab to give it a power reserve, or fill a Battery Chassis with them to build an energy bank.

Each cell is its own item with its own rarity and affixes, so cells do not stack. A cell keeps its stored FE when you take it out, and its durability bar shows how full it is. Cells can be charged by anything that charges FE items.

Cell tiers

Each tier stores more and moves FE faster. Values are before affixes.

Cell	Stage	Capacity	Input	Output	Idle loss	Identity
Potato Battery Cell	0	1,000 FE	8 FE/t	4 FE/t	12%/min	Spud Cell
Iron Battery Cell	1	10,000 FE	128 FE/t	64 FE/t	0	Iron Cell
Copper Battery Cell	2	12,000 FE	256 FE/t	128 FE/t	0.01%/min	Conductive Cell
Lead Battery Cell	3	32,000 FE	256 FE/t	128 FE/t	0	Dense Cell
Invar Battery Cell	4	50,000 FE	512 FE/t	256 FE/t	0	Insulated Cell
Sparksteel Battery Cell	5	100,000 FE	1,024 FE/t	512 FE/t	0.01%/min	Balanced Cell
Arclite Battery Cell	6	400,000 FE	2,048 FE/t	1,024 FE/t	0.02%/min	Signal Cell
Nullite Battery Cell	7	1,600,000 FE	4,096 FE/t	2,048 FE/t	0.02%/min	Phase Cell
Aethergold Battery Cell	7	1,200,000 FE	6,144 FE/t	3,072 FE/t	0	Aetherburst Cell
Exotic Battery Cell	8	10,000,000 FE	8,192 FE/t	4,096 FE/t	0	Harmonic Cell

• Input is how fast the cell can be charged, and Output is how fast it can give power back. Cells always charge twice as fast as they discharge.
• Idle loss is slow leakage. It only drains cells sitting in a Battery Chassis.
• The Aethergold Cell is a sidegrade to Nullite: less capacity, but faster transfer and no leakage.
• The Potato Cell is a novelty starter with heavy leakage.
• Identity is the cell's fixed material trait. Hold Left Shift over a cell to see it in the tooltip. It is a name only and changes nothing beyond the cell's base values.

Unique cells

Two cells are Uniques: found, never crafted, and never refined, though a Volatile Catalyst can corrupt them once.

• The Voltaic Potato Battery Cell is a rare find in village chests. It stores 10,000 FE with 128 FE/t input, 64 FE/t output, and 6%/min idle loss.
• The Bastion Coin-Stack Capacitor comes from bastion treasure chests. It stores 40,000 FE with 512 FE/t input and 128 FE/t output, raises the Burst Transfer and Burst Duration of the Battery Chassis it sits in, and leaks heavily while idle.

Affixes

Cells roll affixes like any other Gear. Capacity affixes come in two kinds: flat (+FE) and percentage (increased capacity). Flat bonuses apply first, so a Copper Cell with +4,000 FE and 25% increased capacity holds (12,000 + 4,000) × 1.25 = 20,000 FE. Other affixes improve transfer rates or reduce leakage. Cells can also roll Efficiency, and the Left Shift tooltip shows an Efficiency value, but it has no effect on how a cell charges or discharges. You can refine standard cells in the Affix Forge.

Cells in machines

Most powered machines have one Battery Cell slot on their Gear tab. FE you feed the machine fills its small internal buffer first, then charges the cell. While working, the machine spends its buffer first, then draws from the cell.

The cell's rates still apply inside a machine. It accepts at most its Input rate each tick and hands over at most its Output rate each tick. When a machine is running on stored power alone, a low-tier cell can limit how fast it works.

Solid Fuel Burners are the exception: they write the FE they generate straight into the cell, and the cell's rates do not limit their output.

Running without a cell

The cell slot is optional on most processors, but leaving it empty has a cost. The machine keeps only its small internal buffer, and:

Machine	Without a cell
Crusher	Keeps only 75% of its Bonus Output above 1×. Crusher Battery Link affixes, and weakly the Scuffed Crush Head affix, win some of that back. The Cell Bypass keystone in Machine Mastery removes the penalty.
Electric Furnace	25% less Processing Speed.
Alloy Furnace	15% less Processing Speed and 10% reduced Stability.
Metal Press	15% less Processing Speed and 20% reduced Stability.
Resonance Calibrator	15% less Processing Speed and 10% reduced Calibration Quality.
Melter	20% less Processing Speed.
Component Assembler	15% less Processing Speed.

Your modpack can change the Crusher and Furnace penalties.

Which cells fit where

Most slots take any cell. These machines limit the stage:

Machine	Cell slot
Solid Fuel Burner	Required. Up to the burner's stage: Stage 1 on the Crude burner, up to Stage 4 on the Steel burner.
Bio Generator	Optional, Stage 0–3.
Coal Gasifier, Syngas Combustor	Optional, Stage 5 or higher.
Steam Methane Reformer	Optional, Stage 6 or higher.
Fuel Cell	Optional, Stage 6 or higher.
Compressor Tank (Steel and higher)	Required, up to the tank's stage.

Modular tools and the Miner's Companion also run on an installed Battery Cell. The Tool Bench installs cells in modular tools and charges both; the Miner's Companion takes its cell in its own Gear tab.

Cells in a Battery Chassis

A Battery Chassis holds several cells and turns them into one energy bank:

• Its capacity is the total of its cells, raised by the chassis's capacity affixes. That bonus only applies while the cells stay in that chassis.
• Its charge and discharge speed is the combined Input and Output of the cells that hold power. One Iron Cell gives a 64 FE/t bank no matter how big the chassis is. Four give 256 FE/t. That rate is per tick and shared by every side and connector of the chassis.
• Cells leak their idle loss here, and some chassis add, reduce, or seal leakage.

Fill a chassis with enough cells to reach the transfer rate you need, not just the capacity.

Making cells

Early cells

Potato, Iron, Copper, and Lead cells have crafting-table recipes that use dry Electrolyte. They roll their traits when crafted and start empty.

Ingredients	Crafting recipe	Notes
Potato Battery Cell Redstone Dust + Electrolyte + Potato + Cable
Iron Battery Cell Electrolyte + Iron Plate + Cell Shell + Conductive Plate + Iron Ingot + Redstone Dust		Requires the Iron material to be enabled.
Copper Battery Cell Electrolyte + Copper Plate + Cell Shell + Conductive Plate + Copper Ingot + Redstone Dust		Requires the Copper material to be enabled.
Lead Battery Cell Electrolyte + Lead Plate + Cell Shell + Conductive Plate + Lead Ingot + Redstone Dust		Requires the Lead material to be enabled.

Assembled cells

Every standard cell from Iron to Exotic can be made in the Component Assembler in two steps:

1. Assemble a Primed Cell Core from a Cell Shell, a Conductive Plate, and Electrolyte Solution. Primed Cell Cores stack and hold no power.
2. Assemble the final cell from one Primed Cell Core, the material's plate or ingot, and Redstone. Sparksteel and higher cells also need a Stabilization Catalyst.

The finished cell starts empty and rolls its traits when assembly completes. The Component Assembler page lists every assembly recipe.

Input		Output	Time	Energy	Rolls traits
	→		11 s	3,200 FE	Yes

Unwanted standard cells can be broken down in a Component Recycler.

See also

• Battery Chassis
• Component Assembler
• Gear
• Stages

RNGTech wiki

Guides	Automation · Battery Cells · Dormant Machines · Gear · Getting Started · Heat · Machine Mastery · Machine Stats · Modpack Creators · Power Chains · Rarity and Affixes · Stages · Uniques
Processing	Alloy Furnace · Component Assembler · Component Recycler · Crusher · Furnace · Melter · Metal Press · Resonance Calibrator · Wooden Composter
Power generation	Bio Generator · Cavitation Generator · Corrosion Cell · Fuel Cell · Potential Reactor · Solar Panel · Solid Fuel Burner · Syngas Combustor · Vacuum Collapse Generator
Energy storage	Battery Chassis
Fluids and gases	Algae Photobioreactor · Ammonia Synthesizer · Coal Gasifier · Fluid and Compressor Tanks · Silica Gel Dehumidifier · Steam Methane Reformer · Wooden Dehumidifier
Refinement	Affix Forge · Exotic Affix Forge
Logistics	Universal Cable
Tools	Forestry Cart Station · Miner's Companion · Modular Tools · Tool Bench