Mr. Joseph Mills reports

INTERNATIONAL BATTERY METALS LTD. REPORTS POSITIVE DLE TEST RESULTS ACROSS MULTIPLE SMACKOVER FORMATION BRINE SOURCES

International Battery Metals Ltd. has released positive results from its testing program on brine samples sourced from multiple operators and resources across the Smackover formation in Texas and Arkansas.

Joseph Mills, chief executive officer of International Battery Metals, commented: "Operators are starting to produce larger quantities of lithium-rich brine water from test wells across the Smackover geological formation, which ranges from southern Arkansas to east Texas. With access to more brine samples, we have been testing our technology across a wide variety of compositions and are seeing the continued high lithium recovery rates and media efficiency that we demonstrated in Utah in 2024, where our modular DLE [direct lithium extraction] plant cleared over 8,400 cycles, and the output was converted into 25 tonnes of battery-grade lithium carbonate. That first commercial deployment gave us high confidence in our modular DLE technology and process.

"Over the past several months, we lab tested brine samples from multiple operators and resources across the Smackover formation and saw consistent results across every composition we tested, with 98-per-cent lithium recovery and better-than-99-per-cent contaminant rejection. These results met our high expectations and further validated the strength of our technology.

"With one brine sample, we were able to perform over 1,200 cycles on a single column with zero degradation, confirming our media's durability. This resiliency test helps us and our potential customers evaluate what the expected operating costs will look like over the commercial lifespan of a project."

About the Smackover formation

The Smackover formation has emerged as one of the most strategically important lithium brine resources in North America. Brine deposits in southern Arkansas and eastern Texas contain lithium concentrations ranging from 200 milligrams per litre to greater than 600 mg/L. The geological formation spans from Texas to Florida and has been producing oil, gas and bromine for over a century, giving it a well-developed regulatory framework and established oil, gas and brine production, including reinjection infrastructure and a deep base of operators with existing subsurface rights. The operators in this exciting geological basin range from major energy companies to smaller independents, all of which hold brine resources that are potentially monetizable through the right DLE partnership. The level of institutional interest in the formation has accelerated rapidly, with significant commercial production growth anticipated over the next decade.

International Battery Metals' modular technology is a natural fit for the Smackover opportunity

International Battery Metals' business model is straightforward. Resource holders bring what they already have: subsurface rights and existing production infrastructure. International Battery Metals brings the extraction technology, process engineering expertise and a commercial pathway to a battery-grade lithium product.

Rather than requiring resource holders to build fixed, site-specific infrastructure, International Battery Metals' deployable plant architecture allows operators of any size to access a proven extraction process without the capital intensity of a greenfield DLE facility. The company is actively engaged with operators across the formation and expects these test results to accelerate partnership discussions.

DLE performance results -- Smackover formation testing program

International Battery Metals' lab-based testing program assessed lithium recovery rates, selectivity against competing ions and eluate purity across brine samples sourced from multiple operators representing a range of compositions present throughout the Smackover formation in eastern Texas and southern Arkansas. The program included a long-cycle endurance/resiliency test as part of the same testing program.

The long-cycle test ran a single extraction column for more than 1,200 cycles with no degradation in performance, providing a direct data point on media resiliency under sustained extraction conditions. The table below shows the consistency of key performance metrics from the Smackover lab testing program against International Battery Metals' prior commercial-scale plant deployment in Utah.

These results confirm that International Battery Metals' technology is capable of delivering consistent lithium recovery and high selectivity across chemically diverse brine sources.

About International Battery Metals Ltd.

International Battery Metals' direct lithium extraction technology is based on proprietary lithium extraction media housed in patented extraction columns. The columns are enclosed in modular, transportable skid-mounted platforms that can be transported and commissioned into production within a short time frame.

Utilizing the patented technology, the company's focus has been on advancing the extraction of lithium chloride from lithium-rich subsurface brine and produced water facilities. The company's unique patented technology is focused on efficient delivery of lithium chloride while minimizing environmental impact.

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