Invinity Energy Systems plc (AIM: IES), a global manufacturer of vanadium flow batteries with factories in the UK and Canada, has announced a significant performance upgrade to its Endurium vanadium flow battery platform, now released for general sale. The latest Endurium module delivers a 50% increase in energy capacity and a 33% increase in peak power output, alongside a range of additional engineering improvements. The company states the upgrade supports further product cost reduction and improved project economics for customers, representing a milestone in its previously announced cost reduction programme.

Key Points

  • Invinity Energy Systems plc (AIM: IES) is a world-leading manufacturer of vanadium flow batteries, with operations in the UK and Canada
  • The upgraded Endurium module has been released for general sale, delivering 50% more energy capacity and 33% higher peak power output
  • Improvements include increased electrolyte capacity, upgraded electrical and power distribution subsystems, and enhanced fluid management and control algorithms
  • Investors should watch for further product roadmap milestones and progress against the company's cost reduction and margin improvement objectives

Endurium's 50% Energy Capacity Gain Achieved Through Multiple Engineering Improvements

The performance gains in the upgraded Endurium module have been achieved through a combination of engineering changes rather than a single modification. Invinity highlights increased electrolyte capacity, upgraded electrical and power distribution subsystems, and improvements to fluid management and control system algorithms as the primary contributors. The company states that these changes together deliver significantly improved power and energy density, meaning fewer modules are required to achieve the same electrical output as before. The upgraded product has now been released for general sale, making it immediately available to customers seeking large-scale, long-duration energy storage solutions.

Fewer Modules Required Per Project, Reducing Installation and Lifecycle Costs for Customers

A key commercial implication of the performance upgrade is that customers will require fewer Endurium modules to meet a given energy storage specification, directly reducing equipment and space requirements. Invinity states this supports lower installation and lifecycle costs, further improving project economics. The Endurium platform is engineered for heavy-duty, high-throughput applications and is designed to operate for 30 years or more without wearing out or posing fire risk — characteristics the company positions as advantages over lithium-ion alternatives. These attributes may be relevant to customers in renewable energy and grid infrastructure sectors seeking durable, long-life storage assets.

Upgrade Delivers on Cost Reduction Programme Recently Reiterated to Shareholders

Invinity's announcement explicitly links the Endurium upgrade to its ongoing product cost reduction programme, the objectives of which the company states were recently reiterated to shareholders. The development was delivered by Invinity's internal product development and R&D teams. Chief Executive Officer Jonathan Marren described the upgrade as "another milestone" and indicated that further improvements remain on the product roadmap, with a continued focus on reducing costs, improving margins, and strengthening Endurium's competitiveness as the company scales. The company did not disclose specific financial metrics, cost savings figures, or margin targets in the announcement.