Indian deep-tech startup Meine Electric has developed what it describes as the world’s first fast-charging iron-air battery system, marking a significant technical advancement in long-duration energy storage.

The technology features a proprietary Fast Charge Long Discharge capability, allowing the battery to charge in six hours and discharge over 18 hours. It has been independently validated by Customized Energy Solutions, a US-headquartered global energy services and technology company and the parent organisation of the India Energy Storage Alliance.

The independent testing was conducted by the CES Battery Laboratory through a structured protocol designed to assess electrochemical performance, capacity retention and operational stability.

Two iron-air electrochemical cells were tested, validating the system’s operational stability under an asymmetric duty cycle comprising six hours of charging followed by 18 hours of discharging per cycle.

Historically, iron-air battery chemistry has been limited by longer charging cycles, with existing approaches focused on multi-day storage applications.

According to DataM Intelligence’s Iron Air Battery Market Size, Long-Duration Energy Storage Forecast 2035; 2026 Report, iron-air batteries are emerging as a promising long-duration energy storage solution due to their ability to provide reliable and scalable storage using abundant materials such as iron.

Global players, including Form Energy in the US and Ore Energy in Europe, have developed iron-air systems for long-duration applications, with existing approaches demonstrating storage durations of up to 100 hours. However, these longer cycle times have restricted their suitability for daily renewable energy balancing.

Meine Electric has addressed this limitation through its proprietary Fast Charge Long Discharge technology, electrode development processes and new system architecture.

The technology enables a six-hour charge and an 18-hour discharge cycle, making it what the company describes as the world’s first fast-charging iron-air battery technology designed for daily-cycling renewable energy applications.

The chemistry also offers inherent safety, reliance on abundant raw materials and lower system costs compared with lithium-ion technology.

Priyansh Mohan, Co-founder and CEO, Meine Electric, said, “Traditional iron-air systems are restricted to multi-day cycles, making them largely incompatible with the intermittent nature of renewable energy generation. Furthermore, solar-heavy grids don’t need a 100-hour battery.

“Unlike regions that require seasonal storage, the renewable challenge across Asia and MEA is fundamentally a daily balancing problem. By engineering our system to capture a full charge within a tight six-to-eight-hour window, we are finally turning iron-air batteries from a sluggish backup chemistry into a foundational, daily-cycling asset.”

The daily-cycling capability aligns with the requirements of rapidly growing renewable energy markets such as India, where the grid requires storage technologies that can capture excess solar generation during the day and discharge it reliably overnight.

For Meine Electric, the development reinforces its progress from laboratory-scale development towards real-world deployment of next-generation storage solutions.

Founded in 2023 by Priyansh Mohan and Stuti Kakkar, Meine Electric is the first company in the Asia-Pacific region and the third player globally to pioneer iron-air long-duration energy storage.

As India works towards its 500 GW renewable energy target by 2030, Meine Electric said its technology offers the following strategic advantages:

Market-leading costs: The proprietary technology operates at a levelised cost of storage of less than $0.05 per kWh, or approximately Rs 5 per kWh.

Daily-cycling capability: The batteries are designed to provide affordable daily cycling and complement lithium-ion systems to support round-the-clock renewable power.

Grid infrastructure: The systems are designed to function as foundational assets for firming renewable energy and increasing the flexibility of thermal assets.

Stuti Kakkar, Co-founder and COO, Meine Electric, said, “The energy industry prioritises lower costs and higher reliability, and iron-air technology is structurally positioned to deliver on both. We are betting on iron-air as a foundational infrastructure play to support the renewable grid.”

The validation by CES adds third-party credibility to Meine Electric’s technology roadmap as the company moves towards larger-scale demonstrations and pilot deployments, while continuing to develop indigenous energy storage solutions to support India’s renewable energy transition.