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Why You Need Power Cells
Every O₂ Tank refill consumes a 
Power Cell. Without a steady supply, your dives end early. Craft several Power Cells before a long expedition so you never surface without air.
Crafting a Power Cell
A Power Cell is crafted at a crafting table from processed metals and a 
Redstone Chunk. Gather the required chunks, smelt them into ingots, then combine them into the cell. Keep the recipe in mind as you gather: Redstone Chunk is the key ingredient, so mine redstone-bearing areas while diving.
Refilling Tanks
To refill, place a Power Cell and your 
Standard O₂ Tank, 
High Capacity O₂ Tank, or 
Reinforced O₂ Tank together in a crafting grid. The charge transfers to the tank and the Power Cell is consumed. Repeat as needed.
Stockpiling
- Mine Redstone Chunk whenever you see it.
- Smelt chunks into ingots in bulk using a blast furnace.
- Craft Power Cells in batches of five or more.
- Store spare cells in a chest near your dive entry point.
- Bring at least two cells per long dive.
A full stack of Power Cells lets you refill many times without returning to base, which matters most when exploring deep water far from shore.
