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Annual Presentation September 14, 2026 FY 2026 Full Year Financial Results

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2 2026 American Battery Technology Company NASDAQ: ABAT2026 American Battery Technology Company 2 NASDAQ: ABAT This presentation contains "forward-looking statements" within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical fact, are "forward-looking statements." Although the American Battery Technology Company's (the "Company") management believes that such forward-looking statements are reasonable, it cannot guarantee that such expectations are, or will be, correct. These forward-looking statements involve a number of risks and uncertainties, which could cause the Company's future results to differ materially from those anticipated. Potential risks and uncertainties include, among others, risks and uncertainties related to the Company’s ability to continue as a going concern; interpretations or reinterpretations of geologic information, unfavorable exploration results, inability to obtain permits required for future exploration, development or production, general economic conditions and conditions affecting the industries in which the Company operates; the uncertainty of regulatory requirements and approvals; fluctuating mineral and commodity prices, final investment approval and the ability to obtain necessary financing on acceptable terms or at all. Additional information regarding the factors that may cause actual results to differ materially from these forward-looking statements is available in the Company's filings with the Securities and Exchange Commission, including the Annual Report on Form 10-K for the year ended June 30, 2026. The Company assumes no obligation to update any of the information contained or referenced in this presentation. Forward-looking statements also include statements concerning the impact of the federal black mass export Directive and the Company’s request for an exception, changes in government policy regarding critical minerals, and the Company’s ability to develop domestic sales channels for black mass. Forward-Looking Statement

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3 Agenda » CEO Opening Remarks » ABTC Business Lines  Lithium-Ion Battery Recycling  Primary Claystone-to-Lithium Hydroxide » FY26 Full Year Financial Summary » Closing Tiff Moehring Head of Communications Ryan Melsert Chief ExecutiveOfficer Alex Flores Chief Finance Officer Nasdaq: ABAT

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9 Claystone to LiOH Business Primary Lithium from Claystone Highlights: Advancing Domestic Lithium Production » Published a milestone Pre-Feasibility Study (PFS) for ABTC’s Tonopah Flats Lithium Project (TFLP), one of the largest identified lithium resources in the United States, detailing approximately 21.3 million tonnes of lithium hydroxide monohydrate resource, including 2.7 million tonnes classified as proven and probable reserves. » Continued advancement of domestic lithium claystone mine and refinery capable of producing approximately 30,000 tonnes per year of battery-grade lithium hydroxide. » Successfully secured reinstatement of the company's $57.7 million U.S. Department of Energy cooperative agreement supporting construction of the first phase of its commercial-scale lithium hydroxide refinery. » Completed National Environmental Policy Act (NEPA) baseline studies for the Tonopah Flats Lithium Project, representing a significant milestone supporting federal permitting activities and advancement toward project commercialization. » Received certification from the U.S. Bureau of Land Management that the mine and refinery Plan of Operations for the TFLP has been accepted » Selected by President Trump’s National Energy Dominance Council (NEDC) and the FAST-41 Permitting Council for designation as a Priority Project for streamlined federal permitting activities. » Continued operation and optimization of the company's integrated lithium hydroxide demonstration facility, producing battery-grade lithium hydroxide samples for customer evaluation and qualification activities. » Advanced development of one of the largest identified lithium resources in the United States to support the development of a secure, resilient, and domestic critical minerals supply chain. Nasdaq: ABAT ABTC is advancing domestic lithium resource development through internally designed extraction and processing technologies intended to support battery-grade critical mineral production in the United States. • Proprietary extraction and processing technologies • Responsible development designed for long-term scale • Strategic support for U.S. energy security and industrial competitiveness • Fast-41 Permitting Priority Project and awarded a $900M EXIM Bank LOI Lithium Mining & Refining Developing one of America’s largest lithium resources

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13 2026 American Battery Technology Company NASDAQ: ABAT2026 American Battery Technology Company 13 NASDAQ: ABAT Qualified Person The mineral resource estimates presented in the ABTC Tonopah Flats Initial Assessment and most recently filed Technical Report Summary were performed by third-party, qualified person RESPEC, LLC and were classified by geological and quantitative confidence in accordance with the Securities and Exchange Commission (SEC) Regulation S-K 1300. Initial Assessment Initial Assessment is a preliminary technical and economic study of the economic potential of all or parts of mineralization to support the disclosure of mineral resources. The Initial Assessment must be prepared by a qualified person and must include appropriate assessments of reasonably assumed technical and economic factors, together with any other relevant operational factors, that are necessary to demonstrate at the time of reporting that there are reasonable prospects for economic extraction. An Initial Assessment is required for disclosure of mineral resources but cannot be used as the basis for disclosure of mineral reserves. An Initial Assessment is preliminary in nature and includes Inferred Mineral Resources that are considered too speculative geologically to have the economic considerations applied that would enable them to be classified as mineral reserves. There is no certainty that the economic results of an initial assessment will be realized. Inferred Resource Inferred Mineral Resource is that part of a mineral resource for which quantity and grade or quality are estimated on the basis of limited geological evidence and sampling. The level of geological uncertainty associated with an Inferred Mineral Resource is too high to apply relevant technical and economic factors likely to influence the prospects of economic extraction in a manner useful for evaluation of economic viability. Because an Inferred Mineral Resource has the lowest level of geological confidence of all mineral resources, which prevents the application of the modifying factors in a manner useful for evaluation of economic viability, an Inferred Mineral Resource may not be considered when assessing the economic viability of a mining project, and may not be converted to a mineral reserve. Indicated Resource Indicated Mineral Resource is that part of a mineral resource for which quantity and grade or quality are estimated on the basis of adequate geological evidence and sampling. The level of geological certainty associated with an Indicated Mineral Resource is sufficient to allow a qualified person to apply modifying factors in sufficient detail to support mine planning and evaluation of the economic viability of the deposit. Because an Indicated Mineral Resource has a lower level of confidence than the level of confidence of a Measured Mineral Resource, an Indicated Mineral Resource may only be converted to a Probable Mineral Reserve. Measured Resource Measured Mineral Resource is that part of a mineral resource for which quantity and grade or quality are estimated on the basis of conclusive geological evidence and sampling. The level of geological certainty associated with a Measured Mineral Resource is sufficient to allow a qualified person to apply modifying factors, as defined in this section, in sufficient detail to support detailed mine planning and final evaluation of the economic viability of the deposit. Because a Measured Mineral Resource has a higher level of confidence than the level of confidence of either an Indicated Mineral Resource or an Inferred Mineral Resource, a Measured Mineral Resource may be converted to a Proven Mineral Reserve or to a Probable Mineral Reserve. Probable Mineral Reserve Probable Mineral Reserve is the economically mineable part of an indicated and, in some cases, a Measured Mineral Resource. Proven Mineral Reserve Proven Mineral Reserve is the economically mineable part of a Measured Mineral Resource and can only result from conversion of a Measured Mineral Resource. Pre-Feasibility Study A Preliminary Feasibility Study (or Pre-Feasibility Study) is a comprehensive study of a range of options for the technical and economic viability of a mineral project that has advanced to a stage where a qualified person has determined (in the case of underground mining) a preferred mining method, or (in the case of surface mining) a pit configuration, and in all cases has determined an effective method of mineral processing and an effective plan to sell the product. A Pre-Feasibility Study includes a financial analysis based on reasonable assumptions, based on appropriate testing, about the modifying factors and the evaluation of any other relevant factors that are sufficient for a qualified person to determine if all or part of the Indicated and Measured Mineral Resources may be converted to mineral reserves at the time of reporting. The financial analysis must have the level of detail necessary to demonstrate, at the time of reporting, that extraction is economically viable. A Pre-Feasibility Study is less comprehensive and results in a lower confidence level than a feasibility study. A Pre-Feasibility study is more comprehensive and results in a higher confidence level than an Initial Assessment. Information Regarding Mineral Resources

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