Based in Fremont, California, Amprius manufactures silicon nanowire anodes and silicon-graphite anodes that offer high anode capacity and battery energy density. Their batteries, first introduced in 2013, utilize silicon nanowire technology developed at Stanford University. Amprius also focuses on improving manufacturing technologies for silicon anodes and developing new cathode materials to increase battery energy density. Their battery ecosystem includes cell design, product development, quality testing, anode manufacturing, cathode development, and battery packaging. Amprius' batteries have applications in various industries, including high altitude pseudo satellites, wearable battery packs, quadcopters, electric vehicles, and smartphones. In 2016, Amprius introduced equipment for high volume manufacturing of their silicon nanowire anodes. They hold patents for structurally controlled deposition of silicon onto nanowires, interconnected hollow nanostructures, and template electrode structures for depositing active materials.