On October 2, 2025, LeydenJar and Chinese battery manufacturer Highpower Technology announced a strategic partnership to develop next-generation lithium-ion cells featuring LeydenJar’s silicon anodes integrated into Highpower’s advanced cell designs. The collaboration aims to deliver ultra-high energy density batteries targeted for small fitness trackers and AI-enabled smart devices.
Under the agreement, LeydenJar supplies its 100% silicon anodes, which offer at least 50% greater energy density compared to standard graphite anodes. Highpower applies its cell architecture and manufacturing processes to scale production and ensure reliable performance, stable cycle life, and safety. In laboratory testing, LeydenJar’s prototype cells achieved 500 cycles without external compression, and both companies are now translating these results into production-ready cells with a nominal stack-level energy density of up to 1350 Wh/L.
To validate the technology at scale, Highpower has built pre-production cells on its pilot line and shipped thousands of prototype units to leading consumer electronics brands for qualification. Production is set to ramp up, with Highpower aiming to deliver tens of thousands of batteries for device testing in 2026. Simultaneously, full-rate manufacturing at LeydenJar’s PlantOne facility in Eindhoven is scheduled to begin in 2027.
Christian Rood, CEO of LeydenJar, noted that the partnership demonstrates the immediate viability of silicon-anode technology in real-world applications. Leo Liao, CTO of Highpower, emphasized that the combined expertise enables breakthrough energy density levels without compromising durability or safety, addressing the power demands of AI-driven devices.
Beyond prototype shipments, LeydenJar and Highpower plan joint development with OEMs to customize batteries for various consumer electronics markets, including wearables, smartphones, laptops, and augmented reality devices. This initiative is positioned to set a new performance standard in the industry as demand for compact, long-lasting power sources continues to grow.
Source: LeydenJar
