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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsNASA’s SPEARS project is developing rechargeable lunar batteries that replace flammable liquid electrolytes with solid ceramic or polymer electrolytes, then use small heaters to bring cells back to operating temperature after deep cold.
Why ordinary batteries struggle on the Moon
A battery on the Moon must handle a temperature cycle far beyond normal terrestrial equipment. At the lunar south pole, NASA reports nighttime temperatures near −328°F (−200°C); sunlit surfaces can reach 212°F (100°C). A lunar night lasts about 354 hours, and NASA’s technical reporting says a lunar polar winter can last up to 4.5 months.
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Conventional lithium-ion cells use a liquid electrolyte to move ions between electrodes. That liquid can freeze during the lunar night, lose performance at high temperatures and evaporate in the vacuum of space. Keeping a conventional battery warm continuously would require insulation, heaters and power-consuming thermal-control hardware that add mass to a spacecraft.
How NASA’s SPEARS cells are different
NASA’s Solid Power for Extreme Environment Adaptability and Resilience in Space (SPEARS) project replaces the liquid electrolyte with a solid ceramic- or polymer-based material. A solid electrolyte removes the liquid phase that can freeze or boil away, allowing the cell to tolerate much colder storage conditions. The chemistry can still be selected for a particular mission rather than using one universal formulation.
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Yi Lin, NASA’s SPEARS testing and research lead, described the design flexibility this way: “Just like the chemistry in your earbuds is different from the chemistry in your phone, which is different from the chemistry in your car, all these chemistries can still function with a solid electrolyte. We can tune for energy, tune for power, tune for durability, depending on the application.”
The cells are not expected to deliver full power immediately after a long, deep freeze. Small heaters warm the battery to its useful operating range only when power is needed. That heater-assisted recovery could reduce the amount of thermal-management equipment that must operate continuously.
What NASA’s thermal-vacuum tests demonstrated
NASA reported the following results from prototype-cell testing in 2026. “Operating” means the cell delivered useful electrochemical performance during the test; “survived exposure” means the temperature excursion did not cause lasting damage, not that the battery produced normal power at that temperature.
| Test condition | NASA-reported result | What it means |
|---|---|---|
| 176°F (80°C) | Operated well | Prototype performance remained strong at this hot condition. |
| −76°F (−60°C) | Operated | Cells produced usable performance at this cold temperature. |
| −112°F (−80°C) | Operated with reduced performance | Cold operation was demonstrated, but output was diminished. |
| 212°F to −274°F (100°C to −170°C) | No sustained damage after exposure | This is a survivability result, not a claim of full-power operation across the entire range. |
Lin said, “We proved for the first time that these cells can work down to minus 80 degrees Celsius.” NASA’s reported results therefore distinguish between useful operation down to −80°C and surviving an even colder −170°C exposure. The Moon’s south-pole night can be colder still, so a mission would likely combine the cells’ cold tolerance with insulation, placement choices and controlled heating.
What happens when a battery enters lunar night
- Idle or hibernate: The spacecraft limits loads while the battery sits in the cold, reducing energy consumption during the long lunar night.
- Warm locally: A small heater raises the cell toward its operating range instead of heating an entire rover or instrument bay.
- Restart the power system: Once ionic movement and cell resistance return to an acceptable level, electronics can draw power.
- Operate or recharge: The battery then supplies equipment or accepts charge, subject to the mission’s temperature, power and cycle limits.
This approach can make thermal control lighter, but the heater itself consumes energy and adds components that must survive launch, radiation, dust and repeated thermal cycles. NASA has not published a final SPEARS heater mass, warm-up time, energy density, cycle-life figure or flight qualification for a specific mission.
Potential lunar uses
| Mission use | Why cold-tolerant power helps | Current status |
|---|---|---|
| Astronaut emergency kits | Portable power could remain stored through severe cold and be warmed when needed. | Candidate application; no deployed SPEARS product has been identified. |
| Drills in permanently shadowed craters | Equipment operating in shadow may face extreme cold while needing bursts of high power. | Candidate application. |
| Rovers | Heater-assisted recovery could reduce the mass of always-on thermal systems. | Candidate application; vehicle-level performance is not yet established. |
| Scientific instruments | Instruments could use localized power during short measurement windows. | Candidate application. |
| Portable power packs | Stored packs could be kept dormant and activated for field work. | Candidate application. |
NASA Ames is developing flight hardware, test boards and electronics for future space-environment testing. SPEARS began in 2026 and remains a technology-development effort rather than an identified retail battery or flight-proven product.
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Are NASA’s lunar batteries solid-state?
Yes. SPEARS is specifically investigating rechargeable batteries with solid electrolytes, including ceramic and polymer types. “Solid-state” describes the electrolyte architecture; it does not by itself specify the electrode chemistry, energy density, charging rate or lifespan. Those characteristics can vary substantially between designs, which is why NASA is testing different chemistries for different power requirements.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallNASA TechPort also identifies possible terrestrial applications for solid-electrolyte batteries, including electric vehicles, electric aircraft and other energy-storage systems. That is a potential dual-use direction, not evidence that a SPEARS cell is currently available for purchase. NASA has said the project could later move toward commercial collaboration, but no partner or commercialization schedule is identified.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A separate strategy: letting conventional cells hibernate
A 2025 NASA technical report describes a different way to handle the lunar night. Selected cylindrical 18650 lithium-ion cells tolerated freeze-and-thaw cycles down to 50 kelvin (−223°C) and recovered their voltage and charge capacity after warming. This approach keeps a conventional liquid-electrolyte battery dormant rather than making it operate continuously at the coldest temperature.
| Approach | Demonstrated condition | Primary advantage | Important limitation or unknown |
|---|---|---|---|
| SPEARS solid-electrolyte cells | Operation to −80°C with reduced performance; survival after exposure to −170°C, according to NASA’s 2026 tests | Designed for extreme environments with localized heater-assisted recovery | Energy density, cycle life, heater requirements and flight readiness are not stated |
| Freeze/thaw hibernation of selected 18650 cells | Freeze/thaw tolerance to 50 K (−223°C), with voltage and capacity recovery after warming, in NASA’s 2025 report | Could preserve conventional cells through long inactive periods | The report does not establish useful continuous power while frozen |
The two methods address different mission needs. SPEARS aims to make the battery itself more tolerant of severe conditions and usable after targeted heating. The 18650 results support a power-hibernation strategy for equipment that can remain off until sunlight or another heat source returns.
What remains before lunar deployment
- Long-duration cycling: A lunar mission may require many charge, discharge, freeze and heat cycles; NASA has not published a complete SPEARS cycle-life result.
- System-level thermal design: Cell tests do not reveal the total insulation, heater, wiring and control-electronics mass for a rover or instrument.
- Power and energy trade-offs: The best chemistry for high energy storage may differ from one optimized for short high-power bursts or long life.
- Environmental qualification: Flight hardware must also be tested for vacuum, radiation, launch vibration, abrasive lunar dust and integration with mission electronics.
- Mission readiness: SPEARS is a NASA development project begun in 2026, not a certified lunar power system or a retail battery.
NASA’s results show a credible path to lunar batteries that can be stored through extreme cold and revived with modest heating. They do not yet establish that a single cell can run a complete lunar mission unaided through the coldest polar night; that will depend on heater energy, thermal design, chemistry selection and flight qualification.
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