Factorial Energy

Factorial Energy, headquartered in Billerica, Massachusetts, develops solid-state batteries. The company names eMobility, defence and AI/robotics as its target markets and states that its technology is largely compatible with existing lithium-ion production lines.

In 2025 Factorial shipped its first FEST lithium-metal cells for drone use to Avidrone Aerospace, a Canadian maker of commercial and military drones. In July 2026 it announced a partnership with the Dutch pack integrator Tulip Tech, which builds battery packs with Factorial cells for UAVs used in defence, security, industrial and commercial applications.

Investors include In-Q-Tel, the strategic investment firm founded by the CIA. Factorial has also worked with automotive manufacturers including Mercedes-Benz, Stellantis and Hyundai.