On July 6, 2026, Chinese scientists in Lanzhou introduced a battery designed to challenge conventional ideas about longevity and maintenance. The Qianjiyuan Tianshu, developed by researchers at Northwest Normal University and Gansu Zhulong Technology, generates electricity from the radioactive decay of carbon-14 without using lithium.
Unlike traditional lithium batteries, which store energy chemically and require recharging, the Qianjiyuan Tianshu produces a continuous trickle of power as carbon-14 atoms decay. The resulting beta particles interact with a silicon carbide semiconductor, converting radiation energy into electrical charge. This betavoltaic process does not rely on a rechargeable cell. Its very low output, but, limits the devices it can power.
The figure of 5,730 years refers to carbon-14’s half-life, the time it takes for half of the isotope in a sample to decay. It does not guarantee that the complete battery will operate for that long or maintain its original output. As the isotope decays, its activity and the theoretical power it can produce decline gradually. The device’s practical durability also depends on its encapsulation and other non-radioactive components, including the electronics and electrical contacts.
Limited Power, Specialized Applications
The reported maximum output is 1.13 microwatts, placing the Qianjiyuan Tianshu in the micro-power category. It is not a substitute for batteries in phones, electric vehicles or household appliances. Its potential lies in low-energy equipment designed to operate for long periods where maintenance is difficult, including remote sensors and scientific instruments.
The device is reported to occupy 16.8 cubic centimeters and contain a 129-millicurie carbon-14 source. Its reported electrical specifications include a short-circuit current of 0.713 microamperes and an open-circuit voltage of 2.06 volts. Those figures define the engineering challenge: applications must be designed around a small, steady supply of power rather than the high output demanded by consumer electronics. Possible settings include deep-space exploration and polar research. Others include underwater monitoring and medical devices, which would also need to meet the requirements for their intended use.
Betavoltaic batteries may suit equipment that needs a long-lived trickle of energy, but the power supply alone does not determine whether a system can function for decades. Sensors and other electronics may need power-management circuits or energy storage to handle intermittent peaks in demand. The stated output points to specialized systems engineered for low consumption, not general-purpose power.
Development and Engineering
The new battery builds on the earlier Zhulong-1 prototype. The reported comparison says the carbon-14 quantity was reduced to 22% of the earlier design’s amount, while short-circuit current rose 2.5 times and maximum power increased by a factor of 2.6. The effective volume reportedly fell by 83%, with volumetric power density increasing 15.5 times. Taken together, the figures describe an effort to integrate the radioactive source and conversion components into a smaller package.
The reported design uses silicon carbide as its energy-conversion semiconductor. That architecture differs from the carbon-14 diamond battery announced by the University of Bristol and the UK Atomic Energy Authority on December 4, 2024. Both concepts draw on beta decay, but use distinct semiconductors and approaches to isotope packaging, power electronics and safety enclosures.
Gansu Zhulong Technology’s reported development pathway covers research, product finalization and trials in intended settings. It also includes standards and mass production, with radioactive-waste recovery as a further step. Potential applications include Internet of Things sensors and implantable medical devices. The company also mentions deep-space exploration and deep-sea equipment. These are prospective uses, each with its own technical and regulatory requirements. A battery’s operating principle alone does not establish its suitability for a particular mission or medical application.
Safety and Service Life
Carbon-14 is a low-energy beta emitter, but a device containing it still requires appropriate controls for handling and encapsulation, as well as for transport, use and eventual disposal. Its safety depends in part on how effectively the radioactive material is contained throughout the product’s life cycle. For medical or aerospace applications, as with other regulated uses, evaluation centers on the complete device and its intended use, not simply the isotope or semiconductor.
The 5,730-year half-life describes the decay rate of carbon-14, not a commercial warranty or a demonstrated maintenance-free lifetime for the assembled battery. Seals and electrical contacts can fail. Electronics can age long before the isotope is exhausted. The Qianjiyuan Tianshu’s significance lies in its potential to supply very low levels of power over extended periods, subject to the durability of the full system and the needs of the application.
For now, the technology points toward niche uses where replacing a battery is impractical or impossible, rather than everyday consumer power. Long-term reliability, safe containment and practical integration would be impressive for betavoltaic systems used in remote monitoring or scientific equipment in extreme environments. Their value will depend on matching an unusually long-lived energy source to devices designed to work with microwatts.
Innovations in energy storage extend beyond nuclear technology. For those seeking practical ways to manage heat and power at home, simple solutions, such as using a damp towel to cool a room, can also make a difference, as explored in this guide to beating the heat without air conditioning.
