A Dutch battery startup, started in 2025.

Europe should use far more of the clean energy it already produces, and burn less gas when the sun goes down. That takes more storage, and better batteries. We are working on both.

Why we started BTTRY.

Solar parks across the Netherlands are increasingly switched off on sunny afternoons, while gas plants still cover the evening peak. At the same time, the grid is full: new connections can take years.

BTTRY started in 2025 to close that gap. Working on storage projects showed us the limits of today’s grid batteries.

So we started building our own: a modular battery that switches each cell on its own, with the power electronics built in. In 2026 it went from simulation to a grid-synchronised lab prototype.

The founders.

BTTRY is built by two TU Delft engineers who have each spent close to twenty years turning hard technology into products that work outside the lab.

Arthur Post Uiterweer

Founder

Physicist (TU Delft, Imperial College London, Cambridge) who has spent his career bringing complex technology to market. As CEO of Quantib he raised €4.5M in nine months, grew the team from 10 to 40, took AI imaging products through FDA clearance and CE marking, and led the sale to RadNet (NASDAQ: RDNT). Earlier he ran Philips Healthcare’s Asia-Pacific imaging business, after four years at the Boston Consulting Group. At BTTRY he leads the ideation, simulation and first bench prototypes of the battery, alongside strategy and finance.

Boudewijn Visser

Founder

Mechanical and offshore engineer (TU Delft) with 17 years of making complex electromechanical systems work reliably in the field. At Ampelmann, the TU Delft spin-off behind self-stabilising offshore access platforms, he headed global operations and 24/7 fleet support, then led R&D and product strategy as Director Innovations. He also led the recommissioning of the Base Load Powerhub (now Phynix) in Eemshaven as a field lab for energy storage and hydrogen. At BTTRY he picks up from the bench and builds the battery into a production system, responsible for the quality system, scalability and control.

Help us build the battery.

We are two founders with a grid-synchronised lab prototype. Taking it to a product needs more people, partners and funding.

Get in touch

Power-electronics and embedded firmware engineers
Battery and cell specialists, especially sodium-ion
Pilot partners: solar park owners and grid operators
Incubators and investors who back deeptech hardware

Let’s talk.

Whether you run an incubator, invest in deeptech, own a solar park or want to build batteries with us, we’d like to hear from you.