Customcells® Contact persons

We are at the disposal of our customers and partners personally. Our employees are the heart of CUSTOMCELLS®. We practice a management concept with flat hierarchies that promotes exceptional commitment and gives all our employees a high degree of personal responsibility. Short reaction times are our strength. In order to be able to connect you directly with the right contact person, you will find an overview of our contact persons here. Contact us and we will connect you directly with the responsible employee. The CUSTOMCELLS® team looks forward to hearing from you.


Jan Diekmann       Dr. Ralf Wagner     Benno Leuthner      Jörg Scheele

Jan Diekmann

Jan already dealt with lithium ion cells during his diploma thesis as a process engineer in 2012 and deepened his knowledge regarding process technology and cell design during his time as a scientific assistant at the Battery LabFactory Braunschweig. As Senior Project Planner at CUSTOMCELLS® Jan is responsible for the planning of customer projects from the first material tests to series production.

Dr. Ralf Wagner

Ralf studied Chemistry (B.Sc.) at the RWTH Aachen and Business Chemistry (M.Sc.) at the University of Münster. He received his doctorate with distinction in the field of electrolytes for lithium ion batteries in the working group of Prof. Martin Winter at the MEET Battery Research Center of the University of Münster. Since 2018 Ralf has been working for CUSTOMCELLS® as senior project planner and sales representative. Since May 2019 he has also been managing director and co-founder of the start-up company E-Lyte Innovations GmbH, which focuses on the development and production of customized electrolytes. He has a total of 8 years experience in the field of lithium ion batteries and is author/co-author of 36 scientific publications and holder of 7 patent applications.

Benno Leuthner

Already during his studies in mechanical engineering Benno started at the P3 group and after his graduation in 2009 he was involved in various projects for the development of high-voltage and low-voltage storage systems. During this time he has gained experience in numerous applications across a wide range of industries. Benno joined CUSTOMCELLS® at the end of 2017 and is responsible for project planning and sales. The passion for special solutions for our customers and their applications is unbroken.

Jörg Scheele

Jörg began his professional career as an aircraft electronics engineer at Deutsche Lufthansa AG. After graduating in business informatics and business administration, Jörg held various positions such as controlling, investor relations, sales and asset manager for international listed companies. Most recently, he worked for many years as Senior Analyst for Goldman Sachs before moving to CUSTOMCELLS® as Senior Sales Manager in May 2017.


Leopold König    Mike Eisermann    Volker Jaeger   Dr. Daniela Werlich   Dr. Martin Ruge    Katharina Anders    Torge Thönnessen

Leopold König

Managing director, founder and one of the visionaries of CUSTOMCELLS®. As early as 2011, Leopold positioned himself for electromobility by moving to the development department for lithium polymer cells at Fraunhofer ISIT and founding CUSTOMCELLS® Itzehoe GmbH the following year. Leopold is a specialist for application analyses and production technologies related to battery cells. Before that, he gained several years of international professional experience in the context of corporate controlling, the digitalization of factories, the construction and new construction of a pharmaceutical production facility in China and the technical support of large-scale real estate projects. The diversity of the individual projects has led to an extensive cross-industry network. He studied industrial engineering at Stralsund University, specialising in mechanical engineering and business management. Previously, Leopold König worked for several years as a paramedic in emergency situations and learned at an early age how to act proactively and lead teams under difficult conditions.

Mike Eisermann

After studying business administration, Mike immersed himself in self-employment as a business graduate. As managing director of an online agency and subsequently as head of an advertising agency, he was responsible for numerous customer projects and concepts for more than 15 years. Today he is responsible for the marketing and PR department at CUSTOMCELLS® and is your contact for advertising, public relations, social media, trade fairs and design & communication.

Volker Jaeger

After completing his technical training, Volker worked as a process technician for several years and then completed further training as a state-certified technician. In the further professional career Volker worked in different technical leading positions and acquired at the same time detailed business administration knowledge by the training to the technical operation manager. In many years of experience as a department and production manager, head of processes & resources, etc., Volker has acquired sound knowledge in the field of management. Volker has been Plant Manager at CUSTOMCELLS® since February 2018 and is driving the further development and industrialization in a targeted manner.

Dr. Daniela Werlich

After receiving her doctorate in chemistry in 2012, Daniela took over a position as project manager at a German cell manufacturer. Here she not only gained comprehensive insights into the process management of lithium-ion cell technology, but was also actively involved in the process during the ramp-up phase. Since 2016 Daniela has been responsible for the continuous development of our technology at CUSTOMCELLS® as CTO of the company in addition to her role as project manager. As a member of the management boards of the PROZELL and FESTBATT clusters and as a member of the board of KLIB, Daniela knows the latest developments in research and industry and can incorporate them into the CUSTOMCELLS® technology.

Dr. Martin Ruge

Martin has been with CUSTOMCELLS® since February 2018. As a business developer and project manager for major projects in the automotive sector, Martin is now responsible for Industrial Engineering. Feasibility studies, process optimization and quality improvements are Martin's focus. He coordinates all customer projects and sets new standards with his team.

Katharina Anders

Katharina studied B.A. Economics and Law and M.A. Human Resource Management. During and after her studies, she also gained practical experience in human resources work in various companies. Her tasks ranged from operative human resources work to Europe-wide strategic human resources projects. Thus, she is ideally equipped for her area of responsibility at CUSTOMCELLS® - the comprehensive management of all HR topics.

Torge Thönnessen

Torge studied chemistry at Philipps-Universität Marburg and Lund University in Sweden. He began his professional career as a scientist at Fraunhofer ISIT in various projects to industrialize the production of lithium battery cells from laboratory scale to industrial scale. During this time he also worked for various start-ups to commercialize special types of lithium battery cell technology at battery system and electrode level. In 2012, Torge founded CUSTOMCELLS® as a spin-off of the Fraunhofer Gesellschaft. Since then he has worked as Managing Director for CUSTOMCELLS®, which has evolved from a start-up to a leading technology provider and prototype manufacturer for OEM, Tier-1, medical, aerospace and marine applications in a growing industrial market segment. Torge and his family live in Hamburg.

contact us now

We are at your disposal by phone at +49 4821 – 133 92 00. Alternatively you write us your request gladly by Mail to contact(at) and we contact you promptly. By indicating the CUSTOMCELLS® contact person of your choice, we will forward your enquiry directly to the person responsible.