Fluid Cell is an IC2 reusable tin-based liquid container that holds 1000 mB and stacks to 64.
Guide
Mine tin ore (or use an IC2 Macerator + Furnace chain on tin dust) until you have at least 4 Tin Ingots — the only material the Fluid Cell recipe needs.
Open a crafting table and place 4 Tin Ingots in a hollow ring (top, left, right, bottom slots) with the centre empty. The recipe yields 1 empty Fluid Cell per craft.
Right-click a water or lava source block, a filled Pump, or a Fluid Distributor connected to a fluid network. The empty Fluid Cell becomes a filled cell holding 1000 mB.
Drop lava cells into the Geothermal Generator, bio-mass cells into the Semifluid Generator, or coolant cells into the Fluid Reactor cooling slot. Machines return empty Fluid Cells for refilling.
Both empty and filled Fluid Cells stack up to 64, unlike vanilla buckets. Use this to batch-transport 64,000 mB of lava in a single inventory slot.
Pair a Pump over a lava lake with a row of empty Fluid Cells in a chest — the Pump auto-fills them and creates a passive fuel supply for the Geothermal Generator.
Place 4 Tin Ingots on a crafting table in a hollow ring — top, left, right, and bottom slots — with the centre empty. The recipe yields 1 empty Fluid Cell.
Yes. Both empty and filled Fluid Cells stack up to 64 in IC2 Experimental, unlike vanilla buckets, which never stack when filled.
A Fluid Cell stores 1000 mB of any registered fluid — water, lava, IC2 Coolant, Bio-Mass, UU-Matter, or Construction Foam.
The Fluid Cell uses tin instead of iron, stacks to 64 even when filled, and is designed as machine I/O rather than for world placement.
The Geothermal Generator, Semifluid Generator, Canning Machine, Solid Heat Generator, and Fluid Reactor all accept Fluid Cells as fluid input or output.