DARPA’s SYMPHONEE: 30‑Year Strontium‑90 Batteries for Military Drones DARPA’s SYMPHONEE: 30‑Year Strontium‑90 Batteries for Military Drones Can a drone fly for years without refueling? DARPA’s SYMPHONEE program is exploring exactly that,using Strontium‑90 (Sr‑90) radioisotope batteries to create compact,long‑life power for unmanned aerial vehicles (UAVs) and other military systems. In this in‑depth guide, we explain what SYMPHONEE aims to …
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