ProLogium, OPmobility partner on EV solid‑state modules (TDAC)

Rhea-AI Filing Summary

ProLogium Holding Inc. and OPmobility signed a Memorandum of Understanding to evaluate and jointly develop solid-state battery modules and packs for electric vehicle applications. The collaboration begins with electrical performance testing of ProLogium cells under agreed protocols while OPmobility leads module design, development and manufacturing.

The release discloses ProLogium cell metrics — 900 Wh/L volumetric energy density, 380 Wh/kg gravimetric energy density, 5%→80% fast charge in ~6.4 minutes, cycle life > 1,200 cycles, and > 95% discharge performance at -20°C — and states planned ramp and mass-production milestones for the Company’s overseas facility with ramp expected between Q4 2028 and Q1 2029 and mass production and deliveries in Q2 2029. Discussions will proceed within applicable competition laws and further details are to be included in the registration/proxy materials filed in connection with the proposed business combination.

Insights

Battery Systems Engineer

MoU moves cell-level performance toward module validation for EV use.

The communication states ProLogium cell metrics explicitly: 900 Wh/L volumetric and 380 Wh/kg gravimetric energy density, fast charge from 5% to 80% in about 6.4 minutes, and cycle life exceeding 1,200 cycles. These are cell‑level specifications the Parties will test and attempt to reproduce at module/pack scale.

Scaling risk remains: system-level thermal management, mechanical packaging, and BMS integration can materially change delivered energy, charge rates and durability. Subsequent technical reports or module test results in follow‑on filings will be the appropriate indicators of success.

Corporate Development Analyst

Partnership structures OEM‑facing validation; commercial timing tied to existing ramp plan.

The MoU frames OPmobility to perform module design and manufacturing while ProLogium supplies cells for agreed electrical testing protocols. The release links the collaboration to accelerating OEM evaluation and integration workflows.

Commercial significance depends on module validation and OEM adoption; the company cites a planned ramp between Q4 2028 and Q1 2029 and mass production in Q2 2029. Outcomes will be disclosed in future registration/proxy materials.

Key Figures

Volumetric energy density: 900 Wh/L Gravimetric energy density: 380 Wh/kg Fast charge: 5% to 80% in ~6.4 minutes +7 more

10 metrics

Volumetric energy density 900 Wh/L ProLogium cell specification

Gravimetric energy density 380 Wh/kg ProLogium cell specification

Fast charge 5% to 80% in ~6.4 minutes ProLogium cell specification

Cycle life >1,200 cycles ProLogium cell specification

Low-temperature discharge >95% performance at -20°C ProLogium cell specification

Cells shipped to date 800,000 cells Company disclosure

Overseas ramp window Ramp Q4 2028–Q1 2029 Planned facility ramp-up timeline

Mass production and deliveries Q2 2029 Planned overseas facility mass production

Patents held 1,100 patents (granted and pending) Company disclosure

Minimum Cash condition $250 million Business combination closing condition mentioned in forward-looking statements

Key Terms

Memorandum of Understanding (MoU), Superfluidized All Inorganic Solid-state Lithium Ceramic Battery, volumetric energy density, module/pack system integration

4 terms

Memorandum of Understanding (MoU) regulatory

"signed a Memorandum of Understanding (MoU) to develop next generation Solid-State Battery Modules"

A memorandum of understanding (MOU) is a written outline where two or more parties describe their shared intentions, key terms and roles for a proposed deal without forming a full binding contract. For investors it acts like a concrete handshake: it signals the seriousness and likely direction of partnerships, mergers or supply arrangements, helping assess the probability, timing and potential impact of future agreements on a company’s value.

Superfluidized All Inorganic Solid-state Lithium Ceramic Battery technical

"ProLogium has disclosed key Superfluidized All Inorganic Solid-state Lithium Ceramic Battery performance metrics"

volumetric energy density technical

"including volumetric energy density of 900 Wh/L and gravimetric energy density of 380 Wh/kg"

Volumetric energy density measures how much energy can be stored in a given physical space — think of it as how much “fuel” fits into a fixed-size tank. It matters to investors because higher volumetric energy density lets devices and vehicles run longer or be smaller for the same energy, which affects product design, market appeal, manufacturing costs and the competitive value of technologies in energy storage and electric mobility.

module/pack system integration technical

"explore and validate how these cell-level advantages can be engineered and verified at module/pack level"

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Filed by Prologium Holding Inc.

Pursuant to Rule 425

under the Securities Act of 1933, as amended

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934, as amended

Subject Company: Translational Development Acquisition Corp.

Commission File No.: 001-42451

Date: June 15, 2026

ProLogium and OPmobility Sign MoU to develop next generation Solid-State Battery Modules for Mobility

From Cells to System Integration: Launching Joint Evaluation of Solid-State Battery Modules for EV Applications

Taiwan/ France — June 9, 2026 — ProLogium, a leader in solid-state battery R&D and mass production, and OPmobility, a world leader in sustainable mobility and a technology partner to mobility players worldwide have signed a Memorandum of Understanding (MoU). The Parties intend to discuss potential cooperation on integrating ProLogium solid-state battery cells into battery modules and/or packs jointly developed for vehicle applications, aiming to deliver a system-level solution that meets the rapidly growing demand of the global EV market.

Collaboration Scope: Start with performance testing and module development, targeting EV OEM adoption

Under the MoU, the Parties will discuss and evaluate a potential collaboration for the joint development and integration of solid-state battery cells into battery modules and/or packs for electric vehicles, with the aim of enhancing competitiveness in the EV industry. Any discussions will be conducted within the framework of applicable competition laws.

In the first phase, ProLogium will provide solid-state battery cells to OPmobility for electrical performance testing in accordance with testing protocols agreed by ProLogium in advance. OPmobility will be responsible for the design, development and manufacturing of battery modules utilizing the solid-state battery cells provided by ProLogium. The shared objective is to jointly develop a battery module solution that can be adopted by OEMs for future EV platforms.

By aligning on common test protocols and engineering workflows, the collaboration is designed to accelerate system-level integration evaluation and engineering convergence, helping both Parties identify key parameters and challenges earlier and improve future OEM engagement efficiency.

Market Advantage Powered by Technology: translating cell-level metrics into EV-ready system competitiveness

To address the EV market’s core needs—range, fast charge, and climate-resilient reliability—ProLogium has disclosed key Superfluidized All Inorganic Solid-state Lithium Ceramic Battery performance metrics, including volumetric energy density of 900 Wh/L and gravimetric energy density of 380 Wh/kg, as well as fast charging from 5% to 80% in about 6.4 minutes. In durability and use-case performance, cycle life exceeds 1,200 cycles, and discharge at -20°C maintains over 95% performance. Through the cooperation discussions with OPmobility, the Parties will explore and validate how these cell-level advantages can be engineered and verified at module/pack level—supporting more efficient OEM evaluation and accelerating the path toward productizable, EV-ready integrated solutions.

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Vincent Yang, Founder and CEO of ProLogium, said: “For solid-state batteries to be truly adopted by the market, the key is system integration and validation—from cells to modules and packs. This MoU with OPmobility starts from pragmatic performance testing and module development under aligned test protocols and engineering workflows, clarifying the critical path for vehicle integration. Our shared goal is an OEM-adoptable module solution, and we will continue to advance discussions within a compliant framework.”

Youssef Souiba, Executive Vice President, President of OPmobility’s C Power Business Group said: “Working with an established leader in the field of solid batteries such as ProLogium strengthens OPmobility’s ability to anticipate the needs of global automotive manufacturers and supports the Group’s ambition to expand its technologies portfolio and its customer reach. It illustrates our capacity to partner with the right partners to innovate and contribute to the development of a more efficient and more sustainable mobility ecosystem.”

About Prologium Holding Inc.

Founded in 2006, Prologium Holding Inc. (“ProLogium”) is an energy innovation company dedicated to the development and manufacturing of next-generation lithium ceramic batteries, holding over 1,100 global patents (granted and pending). In 2013, ProLogium introduced the world’s first next-generation battery architecture featuring a 100% ceramic separator, becoming the first company globally to successfully commercialize solid-state batteries. In 2025, ProLogium again led the industry by introducing the world’s first superfluidized all-inorganic solid-state lithium ceramic battery, integrating the advantages of solid-state and liquid type batteries and redefining next-generation battery technology with automation-ready, scalable mass production and cost competitiveness. In 2026, ProLogium once again received the Edison Awards Gold Award for its superfluidized all-inorganic solid-state lithium ceramic battery technology. With more than 13 years of manufacturing know-how, ProLogium is also the only company globally that can publicly demonstrate a solid-state battery mass-production line—proving that solid-state batteries are not merely a laboratory technology, but a mature solution ready for scalable manufacturing. In 2024, ProLogium inaugurated its first GWh-class gigafactory in Taoyuan, Taiwan, and has shipped more than 800,000 cells to date. In May 2024, ProLogium established its first overseas R&D center in Paris-Saclay, France, providing customized technical support for the European market. The Company’s first overseas GWh-class facility in Dunkirk, France, completed its environmental assessment and building permit process by the end of 2024, with construction expected to begin in 2026. Ramp-up is expected to begin between Q4 2028 and Q1 2029, followed by formal mass production and deliveries in Q2 2029. For more information, visit https://prologium.com/news/.

About Translational Development Acquisition Corp.

Translational Development Acquisition Corp. (“TDAC”) is a blank check company incorporated for the purpose of effecting a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses. TDAC may pursue an acquisition opportunity in any business, industry, sector, or geographical location, and intends to focus on industries that complement its management team’s background and intends to capitalize on the ability of its management team to identify and acquire a business. TDAC’s management team is led by Michael B. Hoffman, its chief executive officer and chairman of the board of directors, and Avanindra C. Das, chief financial officer. In addition, TDAC’s board includes E. Premkumar Reddy, Curtis T. Keith, Matthew A. Kestenbaum and Christopher Jarratt.

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Forward-Looking Statements

This communication contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act of 1934, as amended that are based on beliefs and assumptions and on information currently available to ProLogium and TDAC. In some cases, you can identify forward-looking statements by the following words: “may,” “will,” “could,” “would,” “should,” “expect,” “intend,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “project,” “potential,” “continue,” “ongoing,” “target,” “seek” or the negative or plural of these words, or other similar expressions that are predictions or indicate future events or prospects, although not all forward-looking statements contain these words. Any statements that refer to expectations, projections or other characterizations of future events or circumstances, including projections of market opportunity, number of customers and market share, the capability of ProLogium’s technology, ProLogium’s business plans including its plans to expand globally, the sources and uses of proceeds from the business combination, the anticipated enterprise value of the combined company following the consummation of the business combination, any benefits of ProLogium’s partnerships, strategies or plans as they relate to the business combination, anticipated benefits of the business combination and expectations related to the terms and timing of the business combination are also forward-looking statements. These statements involve risks, uncertainties and other factors that may cause actual results, levels of activity, performance or achievements to be materially different from those expressed or implied by these forward-looking statements. These statements are based on ProLogium’s and TDAC’s reasonable expectations and beliefs concerning future events and involve risks and uncertainties that may cause actual results to differ materially from current expectations. These factors are difficult to predict accurately and may be beyond ProLogium’s and TDAC’s control. Forward-looking statements in this communication or elsewhere speak only as of the date made. New uncertainties and risks arise from time to time, and it is impossible for ProLogium or TDAC to predict these events or how they may affect ProLogium or TDAC. In addition, there will be risks and uncertainties described in the proxy statement / prospectus relating to the business combination, which is expected to be filed by ProLogium with the SEC and other documents filed by ProLogium or TDAC from time to time with the SEC. These filings may identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements. Neither ProLogium nor TDAC can assure you that the forward-looking statements in this communication will prove to be accurate. These forward-looking statements are subject to a number of risks and uncertainties, including, among others, the occurrence of any event, change or other circumstance that could delay, impede or prevent the business combination or give rise to the termination of the Business Combination Agreement; the outcome of any legal proceedings that may be instituted against ProLogium or TDAC, the combined company or others following the announcement of the business combination; the inability to complete the business combination due to the failure to obtain approval of the shareholders of ProLogium or TDAC or to satisfy other conditions to closing (including the $250 million Minimum Cash condition); failure to obtain TDAC deadline extension; the amount of redemption requests made by TDAC’s public shareholders; the ability to maintain the stock exchange listing standards following the consummation of the business combination; the risk that the business combination disrupts current plans and operations of ProLogium or TDAC as a result of the announcement and consummation of the business combination; the ability to execute on its business strategy and the ability to develop and commercialize its solid-state battery technology; the ability to accurately estimate the future supply and demand for its batteries; the ability to respond rapidly to emerging technology trends; the ability to compete effectively and the ability to manage growth; the ability to recognize the anticipated benefits of the business combination; costs related to the business combination; changes in applicable laws or regulations; international trade disputes, including threatened or implemented tariffs by the U.S. and threatened or implemented tariffs by foreign countries in retaliation; the ability of ProLogium to execute its business model, including market acceptance of its planned products and services; the combined company’s ability to raise capital; future financial performance of the combined company following the business combination; the possibility that TDAC or the combined company may be adversely affected by other economic, business and/or competitive factors; risks associated with ProLogium’s efforts to commercialize its products; ProLogium’s ability to maintain its existing agreements with third parties and to negotiate and enter into new definitive agreements on favorable terms, if at all; the impact of competing products on ProLogium’s business; intellectual property-related claims against ProLogium or the combined company; ProLogium’s dependence upon its key personnel and ability to attract and retain such personnel and additional qualified personnel; ProLogium’s ability to source raw materials for its products; and other risks and uncertainties to be set forth in the section entitled “Risk Factors” in the registration statement on Form F-4 to be filed by ProLogium with the SEC and those included under the heading “Risk Factors” in TDAC’s filings with the SEC. There may be additional risks that neither ProLogium nor TDAC presently knows or that ProLogium and TDAC currently believe are immaterial that could also cause actual results to differ from those contained in the forward-looking statements.

In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by ProLogium, TDAC, their respective directors, officers or employees or any other person that ProLogium or TDAC will achieve their objectives and plans in any specified time frame, or at all. The forward-looking statements in this communication represent the views of ProLogium and TDAC as of the date of this communication. Subsequent events and developments may cause those views to change. Except as required by applicable law, neither ProLogium nor TDAC has any duty to, and does not intend to, update or revise the forward-looking statements in this communication after the date of this communication. You should, therefore, not rely on these forward-looking statements as representing the views of ProLogium or TDAC as of any date subsequent to the date of this communication.

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Additional Information and Where to Find It

In connection with the business combination, ProLogium is expected to file with the SEC a registration statement on Form F-4, which will include a proxy statement of TDAC and a prospectus of ProLogium. TDAC shareholders and other interested persons are encouraged to read, when available, the preliminary proxy statement/prospectus included in the registration statement and any other documents filed with the SEC because these documents will contain important information about ProLogium, TDAC and the business combination. After the registration statement is declared effective, the definitive proxy statement/prospectus to be included in the registration statement will be mailed to shareholders of TDAC as of a record date to be established for voting on the business combination. Before making any voting or investment decision, investors and shareholders of TDAC are urged to carefully read the entire registration statement and proxy statement/prospectus, when they become available, and any other relevant documents filed with the SEC, as well as any amendments or supplements to these documents, because they will contain important information about the business combination. The documents filed by TDAC and ProLogium with the SEC may be obtained free of charge at the SEC’s website at www.sec.gov.

Participants in the Solicitation

ProLogium, TDAC and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from TDAC shareholders with respect to the business combination. A list of the names of TDAC’s directors and executive officers and information regarding their interests in the business combination will be included in the proxy statement/prospectus for the business combination when available. Additional information regarding the persons who may, under the rules of the SEC, be deemed participants in the solicitation of TDAC shareholders in connection with the business combination, including a description of their direct or indirect interests, by security holdings or otherwise, will be set forth in the proxy statement/prospectus for the business combination when available.

No Offer or Solicitation

This communication is not a proxy statement or solicitation of a proxy, consent or authorization with respect to any securities or in respect of the business combination and does not constitute an offer to sell or the solicitation of an offer to buy any securities of ProLogium or TDAC, nor shall there be any sale of any such securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of the Securities Act, or an exemption therefrom.

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FAQ

What does the ProLogium–OPmobility MoU mean for TDAC/ProLogium?

It signals a cooperative evaluation to integrate ProLogium cells into EV modules, starting with testing and module development. The parties will align test protocols and engineering workflows to support OEM adoption and will disclose further details in registration/proxy filings.

What cell performance metrics does ProLogium disclose in the filing?

ProLogium discloses 900 Wh/L volumetric energy density, 380 Wh/kg gravimetric energy density, fast charge from 5% to 80% in ~6.4 minutes, cycle life > 1,200 cycles, and > 95% discharge performance at -20°C.

Who will design and build battery modules under the MoU?

OPmobility is designated to lead the design, development and manufacturing of battery modules using ProLogium’s supplied solid-state cells, while ProLogium provides cells for electrical performance testing under agreed protocols.

When does ProLogium expect ramp and mass production at its overseas facility?

The communication states ramp‑up is expected between Q4 2028 and Q1 2029, with formal mass production and deliveries slated for Q2 2029 at the Company’s overseas facility.

How many cells has ProLogium shipped and what manufacturing claims are cited?

ProLogium states it has shipped more than 800,000 cells, operates a GWh-class gigafactory in Taoyuan, Taiwan, and claims it can publicly demonstrate a solid-state battery mass‑production line.