Where to Find Ion Power Cells in Subnautica
You can craft Ion Power Cells using 2 Ion Batteries and 1 Silicone Rubber. To get the Ion Battery blueprint, you'll need to find the Alien Arch caches or the Primary Containment Facility in the Lost River.
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You have to get the Ion Battery blueprint from the Alien Thermal Plant in the Lava Castle! Combine two Ion Batteries with Silicone Rubber and boom, Ion Power Cell!
Check the Alien Thermal Plant in the Lava Castle for the Ion Battery blueprint, then craft it with Silicon Rubber. Easy peasy. =D
Honestly, just farm the materials and craft them. You'll need Ion Cubes, Gold, and Silver to make Ion Batteries, then turn those into Power Cells with Silicone Rubber.
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