A Chinese battery already outlives the machine it might one day power. Betavolt’s BV100 cell is rated to keep generating electricity for 50 years, using the same slow radioactive decay that already runs pacemakers and deep-space probes. It still cannot turn a rotor, and the gap between endurance and force is where the real story sits.
A Real Battery, Announced Two Years Ago
Betavolt, a Beijing startup, announced the BV100 in January 2024, more than two years before renewed attention brought it back into view. The BV100 is a coin-sized cell, 15 by 15 by 5 millimeters, built from a nickel-63 isotope sandwiched between diamond semiconductor layers. Betavolt rated it to run for 50 years, operate between minus 60 and 120 degrees Celsius, and output 100 microwatts at 3 volts. The company said the same approach could eventually let a smartphone run without charging or a drone fly without landing, framed as a future direction rather than a finished product.
It’s worth being precise about what “nuclear” means here, because the word invites more alarm than the object deserves. Betavolt’s cell is not a reactor and has nothing to do with weapons. It’s a sealed radioactive isotope decaying naturally inside a semiconductor, its decay converted directly into a small electric current, the same principle used in pacemakers since the 1970s and in NASA’s Voyager probes since the same decade. Betavolt’s contribution was shrinking it down to coin size, a genuine engineering achievement, even before the power output catches up to the ambition.
The Real Challenge: Turning Microwatts Into Watts
A 50-year lifespan describes how long the isotope keeps decaying, not how much force the battery can deliver at any one moment, and the distinction is the real story here. Betavolt says the BV100 stores about 3,300 milliwatt-hours of energy per gram, a figure the company says beats lithium-ion by a wide margin. Getting the energy out fast enough to spin a rotor is a separate engineering problem, and it’s the one Betavolt is now working to solve. The BV100 currently releases only 100 microwatts, while a small drone motor needs several watts just to hover, a gap of roughly four to five orders of magnitude.
Picture an oil drum with a pinhole in the side rather than an empty promise. Betavolt has said as much itself: the company has a 1-watt version on its roadmap, a jump of ten thousand times over the BV100, and even the 1-watt version would still fall short of powering flight by itself. What’s changed since the original 2024 announcement: the BV100 has reportedly moved into mass production by 2026, a genuine step from lab prototype to shipped hardware many battery startups never reach. Nobody, Betavolt included, has flown a drone on a betavoltaic cell yet, a fair distance still to cover and not a reason to write off the attempt.
The Company Isn’t Alone in the Bet
Betavolt is one of several companies betting on the same underlying physics. City Labs, based in Florida, has sold tritium betavoltaic cells for implanted medical devices and aerospace instruments for more than a decade, real evidence the approach already works reliably at small scale. Infinity Power is developing radioisotope electrochemical cells for remote sensors, undersea equipment, and defense electronics. Arkenlight, in the UK, is building carbon-14 diamond batteries out of recycled nuclear reactor waste, meant for sensors and asset tags able to run for decades without service. Separately, researchers at Northwest Normal University in Gansu province announced a carbon-14 battery in March 2025, unconnected to Betavolt, rated for 50 years and potentially more than 100 under favorable conditions.
None of the four projects has cracked propulsion yet, and none of the companies behind them claim to have. What each has already proven: a small, low-power electronic system, a flight recorder, a location beacon, a medical implant, can run for years without a battery swap. It’s a smaller headline than a drone with no need to land, and it’s also the version of the technology closest to the market, in some cases already there.
A Long Bet, Not a Broken Promise
Versions of the BV100 story keep resurfacing online with headlines bolder than the facts. One recent post called the aircraft a future “permanent satellite,” a phrase Betavolt has never used. The caption underneath the post was more careful, noting the battery’s output is still measured in microwatts, nowhere near enough to replace lithium-ion in a drone or a car, while adding the idea is still fascinating. The caption landed closer to the truth than the graphic sitting above it, and the gap between the two is a gap between two timelines: the one social media rewards and the one engineering runs on.
Battery research, like most hard physical-science problems, moves in small, unglamorous steps, coin cells before drone motors, sensors before satellites, and the pace doesn’t make the underlying bet less worth making. If Betavolt or a rival company closes the distance from microwatts to watts, the reward isn’t a novelty drone that flies forever. It’s a category of devices, sensors, implants, remote infrastructure, running without a battery again, and it’s worth the years of unglamorous engineering it will take to get there.
