Rock Tech Lithium Inc. (TSX-V: RCK) (OTCQX: RCKTF) (FWB: RJIB) (WKN: A1XF0V) is pleased to announce, further to its news releases dated August 29, September 4, and September 5, 2025, the closing of the third and final tranche of its previously announced non-brokered private placement offering pursuant to which the Company sold 1,138,400 units at a price of $0.90 per Unit for aggregate gross proceeds of $1,024,560. In aggregate, the Company has issued an aggregate of 7,231,621 Units for total gross proceeds of $6,508,459 under the first, second, and third tranches of the brokered and non-brokered portions of the Offering.

Each Unit consists of one common share of the Company and one common share purchase warrant of the Company, exercisable at price of $1.17 to purchase one additional common share of the company for a period of three years from the date of issuance thereof.

The Company intends to use the net proceeds raised from the Offering to fund the advancement of the Guben Converter and for general corporate and working capital purposes.

The third tranche of the Offering was completed pursuant to Section 2.3 of Ontario Securities Commission Rule 72-503 – Distributions Outside of Canada and pursuant to the listed issuer financing exemption under Part 5A of National Instrument 45-106 – Prospectus Exemptions, accordingly, the securities issued in connection with the third tranche of the Offering are not subject to a hold period in accordance with applicable Canadian securities laws. The Company has filed on its SEDAR+ profile on August 29, 2025 an offering document pursuant to Form 45-106F19 in accordance with the Listed Issuer Financing Exemption. The LIFE Offering Document can be accessed under the Company’s profile at www.sedarplus.caand on the Company’s website at https://rocktechlithium.com/. Closing of the Offering remains subject to receipt of final approval of the TSX Venture Exchange. In connection with the third tranche closing of the Offering, the Company paid a cash commission of $57,964.50 to certain finders.

This news release does not constitute an offer to sell or a solicitation of an offer to buy nor shall there be any sale of any of the securities in any jurisdiction in which such offer, solicitation or sale would be unlawful, including any of the securities in the United States of America. The securities have not been and will not be registered under the United States Securities Act of 1933, as amended or any state securities laws and may not be offered or sold within the United States or to, or for account or benefit of, U.S. Persons (as defined in Regulation S under the U.S. Securities Act) unless registered under the U.S. Securities Act and applicable state securities laws, or an exemption from such registration requirements is available.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

On behalf of the Company,
Mirco Wojnarowicz
CEO

ABOUT ROCK TECH LITHIUM
Rock Tech is enabling the battery age by making the battery industries in Europe and North America more independent and competitive. The Company’s goal is to ensure the supply of high-quality, locally produced lithium – supporting a resilient, sustainable, and transparent value chain from mine to battery-grade material.

Rock Tech relies on responsible sourcing, state-of-the-art and proven technologies, and a clear focus on circular economy principles. The Company’s lithium hydroxide converter projects in Guben, Germany (24,000 tonnes LHM per year) and Ontario, Canada (up to 36,000 tonnes LCE per year) form the foundation for a stable and regional supply to the battery and automotive industries. The Guben converter has been recognized as a strategic project under the EU Critical Raw Materials Act.

The raw materials for Rock Tech’s converter projects are sourced exclusively from verifiably ESG-compliant suppliers. In Canada, Rock Tech relies, among other sources, on its wholly owned Georgia Lake Project, which ensures a stable and sustainable supply for the North American market and is being developed in close partnership with local First Nations communities. By integrating recycled materials, the company aims to close the local battery loop.

With its facilities, Rock Tech makes a central contribution to battery-grade material sovereignty and the achievement of climate targets. The company works in partnership with industry, policymakers, and community groups, and is committed to open communication and the highest environmental standards.

Rock Tech Lithium Inc, 2700-40 Temperance Street, Toronto ON M5H 0B4 CAN.