SMRTR Science & EngineeringApr 9, 2026Interesting Engineering

US’ nuclear fusion startup to build radioactive batteries for use in space

SMRTR summary

Avalanche Energy received a $5.2 million DARPA contract to develop advanced radioactive batteries that can power laptop-class systems for months while weighing just a few kilograms and delivering over 10 watts per kilogram—a major improvement over current radioactive batteries that produce only 2 watt-hours per kilogram.

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