Why a Battery for the Moon's South Pole Is a Cold-Start Problem

Think about a car that won't start on a frigid morning, then push the temperature to minus 328 degrees Fahrenheit (minus 200 Celsius) — the nighttime condition at the Moon's South Pole. That's the environment NASA's SPEARS project is designing batteries for. The acronym stands for Solid Power for Extreme Environment Adaptability and Resilience in Space, and the goal is a battery that can work immediately when warmed up, powering everything from an astronaut's emergency kit to a rover exploring the Moon's darkest craters, all without posing a fire hazard. NASA Langley's Yi Lin, the project's testing and research lead, holds one of the small coin-cell batteries that went through thermal vacuum testing. NASA frames SPEARS as a tool that could help power a sustained human presence on the Moon through the Artemis campaign. The engineering constraint worth noticing: cold isn't just an efficiency penalty, it's a startup problem, and the fire-safety requirement rules out some of the obvious chemistry workarounds.