Clarios, a provider of low-voltage energy storage solutions, announced the acquisition of Maxwell Technologies, a manufacturer of supercapacitor cells and modules used in mobility, grid, and on-site power applications, including data centers.
Clarios will operate Maxwell Technologies as an independent U.S.-based business unit. Terms of the deal remained undisclosed.
Unlike conventional batteries, supercapacitors charge and release energy almost instantly, making them ideal for storing excess energy and supporting systems during sudden spikes in peak demand. According to the release, Supercapacitors can last up to 1 million cycles, operate within a wide temperature range (-40°C / -40°F to +65°C / 149°F), and require no maintenance or fire-risk mitigation.
The acquisition is expected to strengthen Clarios’ capability to deliver energy storage solutions by enabling the development of a supercapacitor supply chain for U.S. and global OE customers, while also complementing the company’s existing battery circularity and low-voltage technologies.
“Maxwell’s supercapacitors are designed to provide customers with high-power energy storage solutions that emphasize reliability, safety, and long life,” said Mark Wallace, CEO of Clarios. “This integration strengthens our ability to serve our automotive customers and creates a long-term opportunity to expand our presence in non-automotive sectors. Maxwell’s existing customer relationships in Data Centers, Grid, Military, and Industrial applications will be maintained and actively developed under Clarios’ leadership.”
According to Mercom’s 9M and Q3 2025 Funding and M&A for Energy Storage report, a total of 20 Energy Storage M&A transactions were announced in 9M 2025, up from 18 M&A transactions in 9M 2024.
In September, Edify Energy, a renewable energy and battery storage company, entered into a binding agreement to be acquired by global investment group La Caisse (formerly CDPQ). Once completed, the transaction, together with further equity capital funding, is expected to represent an investment of approximately A$1.1 billion (~$725 million).
