BTRY Raises $5.7 Million Seed Funding to Scale Ultra-Thin Solid-State Batteries for IoT and Industrial Applications
BTRY AG, a Swiss deep‑tech battery startup developing ultra‑thin solid‑state lithium‑ion batteries, has successfully closed a $5.7 million oversubscribed seed funding round as it accelerates the industrialisation of its breakthrough energy storage technology. The financing, announced in November 2025, brings fresh capital to the Zurich‑based company as it prepares to scale production and bring its thin‑film batteries out of the lab and into commercial use.
Founded in 2023 as a spin‑off from Empa and ETH Zurich by Dr. Moritz Futscher, Dr. Abdessalem Aribia, and Dr. Yaroslav Romanyuk, BTRY focuses on manufacturing solid‑state batteries that combine ultra‑fast charging, high temperature resilience, and intrinsic safety in a remarkably thin form factor — starting at just 0.1 mm thickness. These batteries are designed for applications where size, safety, and performance are critical, such as in smart connected labels, industrial sensors, medical devices, wearables, and other IoT electronics.
The seed round was led by Redstone VC, a European deep‑tech venture capital firm with a focus on transformative technologies and industrial innovation. Joining Redstone VC in backing BTRY were Bloomhaus Ventures, a Swiss venture capital firm dedicated to scaling pioneering technologies; Linear Capital, an investor specialising in deep‑tech and materials science ventures; Kickfund, a Swiss early‑stage investment group; Kick Foundation, a philanthropic venture initiative that supports high‑potential Swiss startups; and the founders of CustomCells, Leopold König and Torge Thönnessen, as new strategic backers. Existing investors High‑Tech Gründerfonds (HTGF) and Zürcher Kantonalbank (ZKB) also reaffirmed their support by participating in the round.
BTRY plans to use the newly raised capital to industrialise its ultra‑thin solid‑state battery technology by establishing roll‑to‑roll manufacturing capabilities — a production approach that supports high throughput and scalability while maintaining sustainability through solvent‑free manufacturing with minimal material waste. The company intends to use the funds to build production infrastructure, advance its industrial processes, and secure offtake agreements with device manufacturers looking to integrate its batteries into next‑generation products.
The startup’s technology leverages techniques adapted from semiconductor manufacturing to produce solid‑state cells that are safer, faster to charge, and more durable than conventional lithium‑ion batteries. BTRY’s batteries can be charged and discharged within about one minute and operate safely at temperatures up to 150 °C, where traditional cells may fail, swell, or pose safety risks. These performance attributes make BTRY’s batteries particularly compelling for compact and high‑reliability applications that conventional energy storage systems’ve struggled to address.
Investors participating in the round emphasised their confidence in BTRY’s technological edge and commercial potential. Redstone VC’s investment reflects its belief that BTRY’s solid‑state approach could set a new standard in compact, high‑performance energy storage, especially as demand for miniaturised power solutions grows across industrial, medical, and consumer segments. Bloomhaus Ventures highlighted the combination of deep scientific expertise and strong entrepreneurial leadership as key factors positioning BTRY at the forefront of Europe’s emerging battery innovation landscape, while Linear Capital underscored the potential for collaboration between European materials science breakthroughs and global manufacturing expertise.
BTRY’s progress also underscores a broader shift in the energy storage and deep‑tech sector, where investors are increasingly backing hardware‑centric startups with clear pathways to industrialisation and real‑world impact. With this latest funding, BTRY is poised to transition from breakthrough prototypes toward scalable, commercially viable production — a critical step in bringing next‑generation solid‑state batteries into mainstream use.
As BTRY continues to expand, it remains focused on unlocking new markets where space‑constrained, high‑reliability power solutions are essential. Its leadership believes that the combination of technical performance and manufacturability could enable a range of future applications, from industrial IoT and logistics to wearable technology and medical devices. This funding round, achieved in an oversubscribed format, signals strong investor confidence and momentum as BTRY advances toward its mission of redefining energy storage for compact, connected devices worldwide.
