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With our metal-free redox flow battery, we are shaping the future of tomorrow and making an important contribution to the energy revolution.


Our flow battery

The battery – metal-free,
clean, safe


The future is a carbon-neutral society. This vision is what drives us. For the energy transition to succeed, we need to find a sustainable storage solution for surplus renewable energy. 

The metal-free redox flow battery is our answer. With this innovative storage solution, we have developed an alternative to conventional systems, such as lithium-ion batteries and metal-containing redox flow batteries. 

Because our flow battery is metal-free, it does not require any critical raw materials produced under unethical labour practices. The mining of battery metals also often causes environmental damage. Our flow battery is thus environmentally friendly and all its components can be entirely produced in Europe.


Simple and safe

Simple and safe
  • Non-flammable, non-explosive
  • Turnkey energy storage system
  • Low maintenance
  • Operable off-grid


  • Saline solution as electrolyte
  • No heavy metals
  • No aggressive acids
  • Resource-efficient and recyclable


  • External energy storage
  • Power: 100 kW to >2 MW
  • Capacity: 400 kWh to >10 MWh


  • Low-cost resources feedstocks
  • Producible in Europe
  • No risk of supply shortage
  • High planning security
  • Long service life > 10,000 cycles


Saline solution
as storage medium

Redox flow batteries are electrochemical energy storage devices. Redox flow is short for:

Reduction = electrons are bound
Oxidation = electrons are released
Flow = liquid storage medium 

And this is how it works:

  1. Two tanks hold a saline solution, each containing different organic (metal-free) storage materials which function as the anode and cathode.
  2. Charging and discharging is achieved by pumping the saline solution through a cell.
  3. Through this process, electrons are bound and released – electricity is stored.

The result: The battery’s power and capacity can be scaled independently of one another. The amount of electrolyte determines the capacity of the flow battery, while the surface area and number of the cells determine its power.

Grafik Batterie E

Technology comparison

An alternative
to lithium-ion batteries

Companies around the globe are creating new and improved battery solutions.

Most of them are currently focused on lithium-ion technology in electric mobility. Redox flow batteries are a flexible, stationary alternative to lithium-ion batteries – durable and easily scaled up to megawatt storage.

Redox flow batteries are being developed by various consortia in Europe, Asia and the Americas. JenaBatteries is a pioneer in the field.

By not using metals in the storage material, the redox flow battery from JenaBatteries is safer and more sustainable than the conventional metal-containing redox flow battery. The metal-free, low-maintenance redox flow battery from JenaBatteries is perfect for applications with high technical safety requirements. Thanks to its innovative raw material base and low price volatility, it promises planning security for modern energy infrastructures.

  Lead acid battery Lithium-ion battery Vanadium-based-RFB JenaBatteries-RFB
Availability of raw materials kreis minus kreis plus
Substitutability of raw materials minus minus minus plus
No thermal runaway plus minus plus plus
Fire safety plus minus plus plus
No development of flammable gases minus minus minus plus
Easy maintenance minus kreis plus plus
Scalability minus minus plus plus
Long lifetime minus kreis plus plus
Stationary application plus kreis plus plus
Mobile application minus plus minus minus
Purchase price plus minus minus kreis
Low costs over lifetime minus kreis kreis plus

“Leading in the commercialization of organic flow batteries”

Lux Research on JenaBatteries

Product vision

Storage as modular system


BASIS – The calculable energy storage for your energy park

BASIS is our smallest battery module within a container-based modular system. Battery systems from 400 kWh up to high MWh ranges are possible and can be adapted to the individual needs of industrial users. The site requirements for installation are low; a simple concrete foundation is sufficient. As a result of the intrinsic fire safety of our water-based electrolyte, the flow battery can be installed even in critical locations. It can easily be integrated into existing grid environments by means of a flexible control system (BMS). Additional modules allow black start and island operation. If required, special versions are available which, owing to a stacking concept, only take up minimum space. The system is robust and designed for a service life of 20 years.


Demo projects

The flow battery
in practice

The most recent project was completed in 2019: A smart grid has been set up in the Netherlands on the ACRRES test site as part of the EU-funded EnergyKeeper project. JenaBatteries’ metal-free redox flow battery with a capacity of 100 kWh is at the heart of the smart grid.

The project aims to test the intelligent integration of private households’ and commercial businesses’ renewable energy production, storage and consumption under real conditions.

Research and industry partners from Germany, Lithuania, Spain, Israel and Italy are collaborating on this project, funded by the EU programme Horizon 2020 (funding code 731239).

About the project

csm energykeeper