Ensurge Micropower ASA is a California-based company focused on developing and manufacturing advanced solid-state lithium microbatteries. These innovative batteries are specifically designed for small electronic devices such as hearables, wearables, and Internet of Things (IoT) connected devices. Ensurge’s technology addresses critical limitations of traditional lithium-ion (Li-ion) batteries, particularly in applications where small form factors, rapid charging, extended lifespan, and enhanced safety are essential.
By leveraging proprietary materials and manufacturing processes, Ensurge enables original equipment manufacturers (OEMs) to create next-generation connected devices with capabilities previously restricted by conventional battery technology. The company’s commitment to delivering high-performance, compact, and reliable power solutions positions it as a significant contributor to the evolution of portable electronics and the broader e-mobility ecosystem.
Battery Technology
Ensurge’s core offering is its solid-state lithium microbattery technology, distinguishing it from conventional Li-ion solutions. These rechargeable microbatteries range from 1 mAh to 100 mAh in capacity. A key feature of Ensurge’s technology is its anode-less design built on an 11-layer ultrathin structure, utilizing a 10-micron stainless steel substrate. This approach contrasts with traditional battery manufacturing, which often relies on silicon or ceramic.
The company employs solid electrolytes, such as Lithium Phosphorus Oxynitride (LiPON), and uses cathode materials like Lithium Cobalt Oxide (LCO), with an operating voltage of approximately 3.9 V. Ensurge’s unique roll-to-roll printing technology facilitates continuous and scalable fabrication, supporting efficient mass production. These batteries boast a volumetric energy density of 200 Wh/L in current designs, with projections up to 750 Wh/L for thicker configurations. This significantly surpasses typical lithium-polymer batteries, which average around 150 Wh/L. Performance advantages include charging to 80% in 8 minutes and full charge in under 24 minutes, an extended cycle life exceeding 1,000 full charge-discharge cycles, and enhanced safety due to solid electrolytes and steel substrates, providing stability across a broader temperature range and reducing risks. Additionally, these batteries can be customized in size and shape and are compatible with automated Surface Mount Technology (SMT) assembly processes.
Recent Projects
Ensurge has achieved important milestones in its commercialization efforts. As of early 2025, the company resolved all remaining technical issues, enabling commercial shipments of its microbatteries for customer evaluations. Ensurge has successfully delivered its first commercial batch of microbatteries to a Fortune 500 medical device manufacturer for thorough evaluation, demonstrating its product readiness and market acceptance within critical application sectors. The company reported having a commercial pipeline with over 120 prospective customers, indicating wide industry interest in its solid-state microbattery technology.
Investors
Ensurge is publicly traded on the Oslo Stock Exchange under the ticker ENSU and is accessible in the US via a Level 1 ADR on OTCQB as ENMPY. The company has a shareholder base of about 14,000 investors, with the top 30 shareholders controlling approximately 55% of the shares. Around 70% of shareholders are Norwegian, while foreign investors hold about 42.8% of the shares as of mid-2025. Recent capital raises include a fully underwritten private placement in July 2025, which secured NOK 50 million (approximately USD 5 million). This placement issued 40 million new shares at NOK 1.25 per share, managed by Arctic Securities and Skandinaviska Enskilda Banken. Major underwriters and investors include Svelland Global Trading Master Fund and DNB Asset Management. Earlier in 2025, placements raised NOK 40 million in January and NOK 35–50 million in April, reflecting sustained institutional confidence. Insider participation was also noted through employee and existing shareholder subscription right exercises.
Business Details
Location: San Jose, California, USA
Website: https://www.ensurge.com/
LinkedIn: https://www.linkedin.com/company/109490
