Ad hoc announcement pursuant to Art. 53 LR

YVERDON-LES-BAINS, Switzerland, April 29, 2025 – In its decision of April 29, 2025, SIX Exchange Regulation AG approved an extension of the publication deadline of LECLANCHE SA's (SIX: LECN) ("Leclanché" or the "Company") 2024 annual report until May 31, 2025.

Leclanché encountered several obstacles in the finalisation of its 2024 annual report including:

1. The late finalisation of the debt-to-equity conversion announced on March 26, 2025 in order to remedy an over-indebtedness situation prior to the finalisation of the 2024 financial statements with a subordination of the same amount of debt owed to SEF-LUX^[1], which has – amongst other reasons – also led to the late completion of the closing process for both the consolidated accounts and the annual accounts of its subsidiaries.
2. The ongoing efforts to secure bridge financing, which is intended to cover the period until the expected financing from Pinnacle International Venture Capital Limited, as announced to the market on 7 February 2025, prevented Leclanché from finalising the going concern statement of its 2024 annual report and held up several audit tasks.

The Company is continuing to work on closing the remaining outstanding items with its auditors and board of directors and remains confident that it will be able to publish its 2024 annual report before or on May 31, 2025.

Leclanché is releasing its unaudited key financial figures for the year 2024: In 2024, the Company’s consolidated income reached CHF 19.6 million, with customer revenue totaling CHF 17.4 million, a notable increase from the CHF 11.8 million reported in the first half of the year. While revenue from customer contracts recognised under IFRS saw only a modest increase compared to 2023, it is important to highlight the CHF 1.2 million in Net Deferred Revenues^[2] reported on the balance sheet. These represent additional amounts invoiced to customers that have not yet been recognised as revenue, underscoring Leclanché’s prudent financial management and reflecting secured revenue for 2025.

The Company recorded an unaudited net loss of CHF (67.2) million for the year, representing an improvement of nearly 5% compared to the CHF (70.5) million loss in 2023. This improvement was primarily driven by the reversal of provisions for losses at termination for projects that were cancelled in 2024.

As of December 31, 2024, the balance sheet remained stable, with total assets amounting to CHF 108.8 million compared to CHF 106.1 million in 2023, demonstrating the Company’s continued financial discipline and strategic focus.

In its decision of April 29, 2025, SIX Exchange Regulation AG requested Leclanché to insert the below excerpt in this ad hoc announcement:

The temporary exemption from the publication of the 2024 annual report and to file such report with SIX Exchange Regulation AG until 31 May 2025 at the latest is granted with the following reservation (lit. a) and under the following conditions (lit. b):

1. SIX Exchange Regulation AG will usually suspend trading of the registered shares of Leclanché S.A. in the short term according to Art. 57 of the Listing Rules [LR] in case its 2024 annual report is not published in accordance with the provisions on ad hoc publicity (Art. 53 of the Listing Rules [LR] in connection with the Directive on Ad hoc Publicity [DAH]) and not filed with SIX Exchange Regulation AG until Saturday, 31 May 2025, 11.59 pm CET, at the latest.
2. Leclanché S.A. is required to publish a notice in accordance with the provisions on ad hoc publicity concerning this decision until Wednesday, 30 April 2025, 7.30 am CET, at the latest. The notice must contain:

• the unaltered reproduction of the wording of para. I. of this decision, placed in a prominent position;
• the reasons for the application of the Issuer requesting an extension of the deadline to publish its 2024 annual report and to file such report with SIX Exchange Regulation AG;
• the unaudited key figures regularly published by the issuer, in particular net revenue, EBITDA, EBIT, net profit/loss, balance sheet total, equity capital in relation to the issuer’s annual results 2024

For more information, write to info@leclanche.com or visit www.leclanche.com.

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About Leclanché

Leclanché is a world leading provider of low-carbon footprint energy storage solutions based on lithium-ion cell technology. Established in 1909 in Yverdon-les-Bains, Switzerland, Leclanché’s history and heritage is rooted in battery and energy storage innovation. The company’s Swiss culture for precision and quality, together with its production facilities in Germany, make Leclanché the partner of choice for companies seeking the very best in battery performance and who are pioneering positive changes in how energy is produced, distributed and consumed around the world. Leclanché is organised into three business units: energy storage solutions, e-Mobility solutions and specialty battery systems. The company currently employs over 350 people with representative offices in eight countries around the world. Leclanché is listed on the Swiss Stock Exchange (SIX: LECN). SIX Swiss Exchange : ticker symbol LECN | ISIN CH 011 030 311 9

Disclaimer

This press release contains certain forward-looking statements relating to Leclanché's business, which can be identified by terminology such as "strategic", "proposes", "to introduce", "will", "planned", "expected", "commitment", "expects", "set", "preparing", "plans", "estimates", "aims", "would", "potential", "awaiting", "estimated", "proposal", or similar expressions, or by expressed or implied discussions regarding the ramp up of Leclanché's production capacity, potential applications for existing products, or regarding potential future revenues from any such products, or potential future sales or earnings of Leclanché or any of its business units. You should not place undue reliance on these statements. Such forward-looking statements reflect the current views of Leclanché regarding future events, and involve known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from any future results, performance or achievements expressed or implied by such statements. There can be no guarantee that Leclanché's products will achieve any particular revenue levels. Nor can there be any guarantee that Leclanché, or any of the business units, will achieve any particular financial results.

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^[1] SEF-LUX refers to: Strategic Equity Fund - Renewable Energy, Luxembourg, AM Investment SCA SICAV RAIF - Global Growth, Sub-Fund, Luxembourg, collectively are in aggregate the main shareholder of Leclanché, hereunder referred to as “SEF-LUX”. Pure Capital S.A. being the beneficial owner as per the reporting platform of SIX Exchange Regulation AG’s Disclosure Office – Date of publication of the most recent notification: 21 February 2025.

^[2] Net Deferred Revenues are defined as Contract Liabilities less Contract Assets