Universal batteries were standardized energy units that worked on the basis of direct conversion of radiation to electricity. They could not supply varying amounts unless linked to separate storage cells, but they could supply a steady and constant low amperage output for decades. In a culture where fusion reactors were compact and common these were not in widespread use, but they were useful for supplying lighting to habitats that were still under construction, and which had not yet been wired into a primary power source. And of course, they were the power source of preference for emergency equipment.

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