$4.6m · Seed · Energy · Stockholm, Sweden
Stockholm-based Rebaba has raised $4.6m (SEK 44.1m) in an oversubscribed seed round to expand its second-life battery storage business. Sistafund led the round alongside EIT Urban Mobility, with participation from existing shareholders and new European investors.
Rebaba builds stationary energy storage systems from electric-vehicle batteries recovered from the market. Its Companion product is a compact 40 kWh cabinet for residential and smaller commercial sites, while its Containerised systems target commercial and industrial applications. The company says its systems can support load shifting, storage of locally generated power, peak shaving and grid-balancing services.
Reuse economics depend on production discipline
A second-life model shifts part of the storage cost from manufacturing new cells to sourcing, testing and configuring used batteries. That creates a circular supply advantage only if Rebaba can turn batteries with different histories into systems whose performance and safety customers can trust. Its control technology, testing process and ability to support installations therefore matter as much as access to retired packs.
Rebaba says it has completed a year of production at its Stockholm CircularHub and has commercial deployments across Sweden. The new capital will support an expansion of that facility to 40 MWh of annual capacity, hiring, partnerships and additional European production hubs. Those steps move the company from proving that reused packs can work toward proving that the model can be repeated across sites and markets.
The commercial proposition also combines hardware with customer energy economics. Storage can reduce peak-power charges, defer grid upgrades and earn flexibility revenue, but the realised value depends on each site's load profile and operating rules. Scaling production must therefore be matched by project selection, warranty confidence and operating data that make the savings credible for property, industrial and charging customers.
