Swiss startup BTRY has raised $5.7 million in seed funding to move its ultra-slim solid-state lithium-ion batteries from lab validation to full-scale industrial production. The round was led by Redstone VC with participation from Bloomhaus Ventures, Linear Capital, Kickfund, Kick Foundation, and CustomCells founders, alongside renewed support from HTGF and Zürcher Kantonalbank.
Compact resilience
Founded in 2023 as a spin-off from Empa and ETH Zurich, BTRY designs batteries that measure just 0.1 mm thick, charge in under a minute, and remain stable up to 150°C without swelling or ignition. These cells are built using semiconductor-derived processes that deliver non-flammable safety and temperature resilience, making them ideal for wearables, sensors, and industrial devices operating in extreme conditions.
European scale-up
The new capital will accelerate roll-to-roll manufacturing, positioning BTRY to serve high-value markets that demand compact, reliable power sources. Its approach leverages vacuum deposition and stackable architectures, enabling solvent-free, low-waste production using existing semiconductor tools. The result is a pathway to scalable European manufacturing for next-generation energy storage.
Strategic insight
BTRY’s seed funding reinforces Europe’s growing stake in advanced battery innovation. The firm’s ultra-slim solid-state design positions it at the intersection of safety, speed, and precision manufacturing, an area once dominated by Asian producers.
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Reference
Chesnokova, S. (2025, November 6). Swiss Startup BTRY scoops $5.7M to scale paper-thin batteries. Tech Funding News. https://techfundingnews.com/btry-ultra-thin-solid-state-batteries-57m-funding/
