XL Batteries: $7.5 Million Raised For Long-Duration Energy Storage Solutions

By Amit Chowdhry ● Sep 22, 2025

XL Batteries is an innovative energy storage company that is focused on creating a new, more affordable, and safer way to store energy for long periods. Recently, the company announced a significant investment of $7.5 million from Merrin Investors, an organization founded by entrepreneur and philanthropist Seth Merrin. This funding is crucial for XL Batteries as it will help the company scale its operations, improve the reliability of electrical grids, and foster energy independence by reducing the need to rely on foreign supply chains for materials and technology.

Today’s electrical grids are facing immense pressure due to the growing demands from various sectors, including data centers, widespread electrification, and manufacturing. As these demands increase, finding scalable, safe, and flexible long-duration energy storage solutions becomes vital. Flow batteries have been recognized as a robust solution for energy storage, but they often come with high costs and risks due to their reliance on scarce and expensive materials.

XL Batteries is addressing these challenges head-on with its innovative approach. The company has developed a unique Organic Flow Battery that uses proprietary, organic, and low-cost electrolytes instead of the traditional materials like vanadium, which are not only costly but also corrosive. By shifting to these more accessible materials, XL Batteries is able to significantly reduce both the risks and costs associated with energy storage. This development also eliminates the need for specialized infrastructure and intricate supply chains, making their solution more practical for widespread use.

The investment from Merrin Investors will significantly support XL Batteries in advancing its commercial efforts, further establishing the company as a leader in the long-duration energy storage sector. This is particularly important given the current challenges many companies in the energy sector are facing. XL Batteries is well-positioned to succeed with its capital-light approach and readiness for commercial deployment.

The technology developed by XL Batteries is designed to meet a variety of power needs, ensuring that utilities, data centers, and industrial users can rely on consistent access to energy. Recently, XL Batteries has achieved several significant milestones that showcase its growth and potential. For example, the company has formed a strategic partnership with Prometheus Hyperscale, enabling large-scale deployments of their flow battery technology at data center campuses. This initiative represents a groundbreaking application of flow batteries in the United States. In addition, they have launched a commercial-scale pilot project with Stolthaven Terminals located in Houston, Texas.

KEY QUOTES:

“This investment from Merrin Investors underscores that XL Batteries is built to thrive in today’s environment. Over the past several months, XL has hit several key milestones that prove our technology is effective. Now, with Merrin’s support, we are bringing the next generation of safe, cost-effective, long-duration batteries to market at a pace to meet growing demand.”

Tom Sisto, Co-Founder and CEO of XL Batteries

“I’m thrilled to back XL Batteries because they are rewriting the rules of industrial-scale storage. Its breakthrough, non-flammable technology delivers lower cost, longer life, and greater safety than anything else on the market. This investment will help accelerate the company’s ability to lead a trillion-dollar market while supporting the clean-energy transition — a perfect example of doing well by doing good.”

Seth Merrin, Founder of Merrin Investors

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