Strong Independent U.S. Validation of Gelion's NES

Gelion’s NES battery tech retained 92% capacity at 20x cycling rate in independent U.S. tests.

What the company is saying

Gelion plc is highlighting independent validation by the U.S. National Laboratory of the Rockies (NLR) of its Nano-Encapsulated Sulfur (NES) cathode material, emphasizing reproducibility and high-rate performance. The company frames the results as strong preliminary evidence that NES can retain 92% of reference capacity even when cycling rate is increased twentyfold, supporting its suitability for high-power applications like drones, defence, and aerospace. The announcement stresses that NLR’s findings are consistent with Gelion’s internal data and are complemented by QinetiQ’s earlier demonstration of NES pouch cells performing repeated 3C and 6C cycles. Gelion positions NES as a drop-in, low-cost, sulfur-based alternative to critical-mineral cathodes, aiming to address supply chain constraints. CEO Matt Wood and NLR’s Matthew Keyser both express confidence in the reproducibility and application potential of the technology, with the company underscoring its partnerships with major industry players in the UK, Japan, Germany, and the U.S. The tone is confident and forward-looking, focusing on technical achievement and the path toward commercial qualification.

What the data suggests

The independent NLR tests confirmed that NES-based coin cells retained 92% of their reference capacity when cycling rate was increased from 0.1C to 2C, a 20-fold acceleration. This high-rate performance is a significant technical milestone, demonstrating that the material can maintain capacity under demanding conditions. The result is consistent with Gelion’s internal laboratory findings and is further supported by QinetiQ’s prior demonstration of NES pouch cells handling sustained 3C and 6C cycles, including 6C vertical take-off and landing pulses. The 6C rate equates to a full charge or discharge in about 10 minutes, which is relevant for rapid-charging applications. The announcement details that these results were achieved using Gelion’s baseline lithium-metal anode platform and that NLR independently fabricated electrodes and assembled cells, confirming reproducibility outside Gelion’s own facilities. No commercial sales, revenue, or cost figures are disclosed, and the results pertain to laboratory-scale coin and pouch cells rather than commercial-scale batteries. The data supports the claim of strong technical performance but does not yet demonstrate commercial readiness or large-scale manufacturability.

Analysis

The announcement presents strong technical validation of Gelion's NES™ battery material, with independent testing by NLR confirming 92% capacity retention at high cycling rates. These are realised, measurable results at the coin cell level, and the technical data is credible and specific. However, the narrative extends beyond these facts to highlight the 'potential' for commercial qualification in defence, aerospace, and drone applications, and references a long-term goal of U.S. government procurement and domestic manufacturing. These forward-looking claims are not yet realised and depend on further development, prototyping, and validation. The capital intensity flag is triggered by references to the development of larger-format prototypes and U.S. manufacturing, with no immediate earnings or commercial impact disclosed. The tone is optimistic and at times promotional, but the technical achievements are genuine; the gap lies in projecting commercial and supply chain benefits that remain unproven at this stage.

Risk flags

• ●The transition from laboratory-scale coin cell validation to commercial-scale pouch cell production is a major execution risk, as technical performance does not always translate to manufacturability or reliability at scale. This matters because commercial adoption depends on successful scaling and consistent performance in real-world conditions.
• ●No financial metrics, commercial agreements, or revenue figures are disclosed, leaving investors unable to assess the near-term economic impact or the company's funding needs for further development and scaling. This lack of financial transparency increases uncertainty around the path to profitability.
• ●The announcement projects future qualification for U.S. government and defence procurement, but these are long-dated, competitive, and highly regulated processes with no guaranteed outcome. Failure to achieve these milestones would limit commercial impact.
• ●Claims of supply chain advantages and drop-in compatibility are asserted but not demonstrated at scale, meaning that unforeseen integration or supply challenges could arise during commercialisation.

Bottom line

Gelion’s NES battery material has cleared a key technical hurdle, with independent U.S. testing confirming 92% capacity retention at a 20-fold higher cycling rate, validating the technology’s high-power potential. The results are credible at the laboratory scale and are reinforced by third-party testing, but the announcement stops short of demonstrating commercial-scale readiness or disclosing any financial impact. The company’s narrative is ambitious, projecting future government procurement and domestic manufacturing, but these remain long-term goals with significant execution risk. Investors should watch for evidence of successful pouch-cell prototyping, commercial agreements, and financial disclosures in future updates. The most important takeaway is that Gelion’s technology is now independently validated at the coin cell level, but the path to commercial adoption and revenue generation is still at an early stage.

Announcement summary

(LSE:GELN) Gelion plc announced strong preliminary results from independent testing of its Nano-Encapsulated Sulfur (NES™) Cathode Active Material (CAM) by the National Laboratory of the Rockies (NLR) under a Cooperative Research and Development Agreement (CRADA) announced on 30 June 2026. The NLR, the U.S. Department of Energy’s primary national laboratory for critical minerals, energy innovation, and energy security, fabricated electrodes from Gelion’s NES™ CAM, assembled coin cells using Gelion’s baseline lithium-metal anode platform, and independently reproduced key electrochemical characteristics observed in Gelion's own laboratories. The NES™ cells built and tested by NLR retained 92% of their reference capacity despite a 20-fold increase in cycling rate from 0.1C to 2C. This result supports the progression towards commercial qualification in defence, aerospace, and drone applications. NLR’s capacity-retention result complements QinetiQ’s earlier demonstration that NES™ pouch cells support repeated high-power cycling, including sustained 3C drone-cruise operation and 6C VTOL pulses. A 6C rate is equivalent to a theoretical full charge or discharge in approximately 10 minutes. The combined results support the potential of NES™ for drones, defence, aerospace, and other applications requiring both high energy and high-power delivery. The CRADA is intended to advance NES™ through materials development, pouch-cell prototyping, and further testing at NLR’s facility in Golden, Colorado. The next stage of the programme includes the planned development and validation of larger-format commercial pouch-cell prototypes, with the longer-term goal of supporting qualification for U.S. government and defence procurement and the development of domestic U.S. manufacturing capability. Gelion’s NES™ is made from sulfur, which is abundant, mining-free, and free from supply chain constraints, and is designed to drop-in to existing global manufacturing lines. The results add to the growing body of testing undertaken through Gelion’s laboratories and external programmes involving TDK, QinetiQ, NLR, and the Max Planck Institute of Colloids and Interfaces (MPI). Gelion works with Tier One industrial partners including TDK and Mitsui Kinzoku (Japan), QinetiQ and Nissan (UK), a Top 15 Global Automotive Manufacturer, a Top 5 Global Automotive Manufacturer, NLR (US), and MPI (Germany). Matthew Keyser, Electrochemical Energy Storage lead at NLR, stated that the results demonstrate both the reproducibility and strong high-rate performance of Gelion’s NES™ material and provide a solid basis for progressing NLR's validation programme. Matt Wood, CEO of Gelion, expressed satisfaction with the preliminary results and highlighted the value of independent validation and collaboration with NLR.

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