Amsterdam, The Netherlands – 28 October 2025 – At CES Unveiled Europe, E-magy B.V. and Rebel Cactus proudly announced the signing of a strategic Memorandum of Understanding (MoU) to co-develop a customised lithium-ion battery cell for Rebel Cactus’s next-generation children’s smartwatch.
The signing ceremony was witnessed by distinguished officials, including the President of the Consumer Technology Association (CTA) — the owner and producer of CES — as well as the Director of Entrepreneurship at the Dutch Ministry of Economic Affairs, underscoring the significance of this partnership on a global stage.
This collaboration marks a significant step forward in wearable technology innovation, combining E-magy’s advanced nanoporous silicon anode material with Rebel Cactus’ expertise in designing smartwatches tailored for young users.
The new battery cell will power advanced smartwatch features, such as always-on connectivity and location tracking, while maintaining a compact size and providing long battery life.
The MoU establishes a long-term partnership focused on:
• Co-developing silicon-dominant anode battery cells tailored for wearable applications.
• Integrating and testing these cells within Rebel Cactus’ smartwatch platform.
• Validating E-magy’s battery prototypes in real-world use cases.
By adopting E-magy’s silicon anode technology, Rebel Cactus secures a future-ready energy solution that boosts performance and sets the brand apart in a competitive market.
“We’re excited to partner with Rebel Cactus to demonstrate the potential of E-magy technology and bring our high-performance silicon anode technology into the wearable space. This MoU with Rebel Cactus for smartwatch cell development represents a significant milestone for E-magy. Rebel Cactus’ technology, along with its specialised knowledge, expertise, and experience in developing children’s smartwatches and software platform, sets new standards in the industry,” stated E-magy CEO Casper Peeters.
“At Rebel Cactus, our mission is to empower kids worldwide with smart, safe, and fun technology, so they play to learn anytime, anywhere. We stand for a generation of 100 million happy, healthy, and resilient children & teens. Partnering with E-magy allows us to push the boundaries of what’s possible in terms of battery life and performance, making our next-gen smartwatch even more reliable and exciting,” stated Rebel Cactus CEO Michael Greve.
The MoU was signed during CES Unveiled Europe in Amsterdam, an exclusive event spotlighting Europe’s thriving innovation ecosystem and paving the way to CES 2026.
ABOUT E-MAGY
E-magy is a European advanced materials manufacturer revolutionising Li-ion batteries with its innovative silicon anode material. We drive the transition to electric mobility and next-generation battery-powered devices across sectors, including drones and consumer electronics. Using our proven, patented and proprietary manufacturing process, we develop third-generation silicon anodes, also known as silicon-dominant anodes (over 80% silicon by weight). We offer scalable solutions that empower manufacturers to achieve up to 40% higher energy density and 3x faster charging while reducing silicon expansion and minimising environmental impact. This makes next-generation lithium-ion batteries a reality.
ABOUT REBEL CACTUS
Rebel Cactus (RC) is a Dutch consumer electronics brand operated by Hallofo B.V., headquartered in Amstelveen, the Netherlands. The company was founded in 2013 and focuses on the development and worldwide distribution of smartwatches for children. Rebel Cactus is specially designed by and for kids and teens. Our smartwatches, which allow you to stay in touch with each other, have a closed, secure Rebel Cactus App Store with edutainment and communication apps that parents can control. These include Spotify, Storytel, the BinGO outdoor play app, WhatsApp, Signal, and more. Our smartwatches grow with your child. Thus, we offer a smart start with ‘your first smartwatch’, the best alternative for a first smartphone, to enable children to explore the digital world safely and responsibly.
MEDIA CONTACT
E-magy
Benoit Hurtel – Marketing & Communications Manager
benoit.hurtel@e-magy.com
Rebel Cactus
Annemarie Greve – Sales & Marketing Director
annemarie.greve@rebelcactus.com