Epsilor Electric Fuel Ltd., a globally recognized manufacturer of smart lithium-ion batteries and charging solutions, has announced the launch of what it claims to be the most energy-dense 6T battery currently available for military use. The newly developed battery—COMBATT ELI-52526-GM—will make its debut at DSEI UK 2025 (Defence and Security Equipment International), held from September 9–12 at ExCel London, where Epsilor will showcase its technology at Stand N11-104.
The Israeli energy storage developer, part of the Michigan-headquartered Arotech Corporation, stated that the new battery achieves a capacity of 4,400Wh / 174Ah at 25.2V, significantly outperforming both traditional Lead-Acid 6T batteries and existing lithium-based equivalents. According to Epsilor, the energy density is six times higher than that of comparable Lead-Acid models, and 50% greater than any other 6T lithium-ion battery on the market.
The battery weighs just 27 kilograms, making it a highly compact solution for power-intensive defense platforms such as armored vehicles, deployable weapon systems, and naval applications.
How does the new 6T battery compare with traditional lithium and lead-acid batteries used in defense platforms?
The 6T battery format is a NATO-standardized enclosure widely used across ground combat vehicles and other military equipment. However, limitations in energy density, weight, and thermal performance have led to incremental innovations from suppliers across the globe.
Epsilor’s new COMBATT battery claims to address these limitations by employing proprietary cell chemistry and a unique energy-absorbing structure that balances high output with safety. The firm emphasized that this allows it to comply with the MIL-PRF-32565C Type 2 U.S. Army military performance specification, which mandates rigorous safety and durability testing for lithium-ion batteries.
These include tests for bullet penetration resistance, thermal exposure up to 500°C, operational stability in extreme cold and heat, and long-cycle reliability, as well as electronic platform communication protocols. Epsilor noted that its battery has already undergone several of these assessments at U.S.-based laboratories as part of its ongoing certification campaign.
What safety improvements were introduced to address lithium-ion fire risks in defense applications?
Ronen Badichi, President and General Manager of Epsilor, stated that safety and regulatory compliance were primary design imperatives for the new battery. He noted that the team had successfully overcome the lithium safety issue, which continues to be a major concern in both civilian and defense energy storage contexts.
According to Badichi, Epsilor’s team deployed a unique energy-absorbing design to ensure thermal containment and reduce the risk of catastrophic failure under harsh battlefield conditions. He emphasized that these design improvements did not compromise the battery’s energy output, noting that it still delivers the highest energy capacity in the 6T category.
While full certification is still in progress, the company expressed confidence that the battery will soon be among the few to carry the coveted MIL-PRF-32565C Type 2 compliance mark, which would place it on a shortlist of approved batteries for U.S. Department of Defense procurement.
What other 6T battery variants are included in Epsilor’s COMBATT product line?
Epsilor’s newly launched COMBATT ELI-52526-GM joins an expanding product portfolio tailored to the evolving needs of defense OEMs and armed forces worldwide. The company offers a variety of 6T lithium-ion and lithium-iron phosphate (LFP) batteries, each designed for specific performance envelopes and compliance levels.
Among the key models in the lineup are:
COMBATT ELI-52526-DM/GM: High-capacity lithium-ion variants that deliver between 3.6kWh to 4.4kWh (144Ah–174Ah), designed to meet MIL-PRF-32565C Type 2 standards for energy density and durability.
COMBATT ELP-02426-M: A high-capacity LFP-based model, offering 2,560Wh / 100Ah, developed with a focus on superior thermal stability and MIL-PRF-32565C Type 1 compliance. This battery is particularly suited for mission-critical applications where safety trumps absolute energy output.
COMBATT ELI-52526-C: A cost-efficient high-density lithium-ion solution delivering 4.2kWh (166Ah), positioned for robotics, tactical storage, and micro-grid use cases. While not the top performer in raw energy terms, it provides a value-oriented option for lighter platforms and support systems.
With the addition of the COMBATT ELI-52526-GM, Epsilor is targeting heavy-duty military vehicles and combat energy logistics systems that require long-lasting, lightweight, and field-proven battery packs.
Why is certification to MIL-PRF-32565C standards important for military energy systems procurement?
The MIL-PRF-32565C military standard is one of the most demanding specifications globally for rechargeable batteries. Split into Type 1 (generally for safer chemistries like LFP) and Type 2 (for higher-output lithium chemistries), it covers everything from drop shock and puncture resilience to thermal abuse tolerance, communication interface integrity, and long-duration cycling.
For defense contractors and procurement officials, having MIL-PRF-certified components is often a non-negotiable requirement—especially for deployment in U.S.-origin vehicles or systems integrated into NATO programs. Epsilor’s ongoing test campaign for MIL-PRF compliance signals that the firm intends to position its batteries as global standards-compliant alternatives, reducing reliance on legacy lead-acid systems.
This certification drive could also strengthen Epsilor’s hand in future contract bids across U.S. Army, NATO allies, and partner defense agencies in Asia and Europe.
How does Epsilor’s global positioning within Arotech enhance its commercial and strategic reach?
Epsilor Electric Fuel Ltd. operates from Israel but functions under the umbrella of Arotech Corporation, a Michigan-based defense and security technologies group. Arotech has historically focused on military simulation, training systems, and energy solutions, with Epsilor serving as the battery and mobile power systems arm of the portfolio.
This affiliation gives Epsilor direct access to the U.S. defense industrial base, enabling smoother integration into government procurement channels and defense OEM partnerships. It also positions Epsilor to scale production for North American, European, and Indo-Pacific defense markets, where battery reliability, field-serviceability, and form factor compatibility remain core purchase criteria.
While Epsilor’s batteries are manufactured with global standards in mind, its alignment with Arotech gives it a dual-market advantage—blending Israeli R&D innovation with American commercial scaling.
What are analysts and institutional stakeholders watching in the defense battery segment right now?
With lithium-ion battery adoption accelerating across both commercial and defense applications, institutional investors are closely monitoring dual-use technology developers like Epsilor. The emergence of energy-dense but thermally stable battery systems is seen as a key enabler for next-gen armored vehicles, electric tactical units, and autonomous military robotics.
Analysts note that energy density, certification status, and modular form factor compatibility are the three most critical benchmarks for winning defense contracts. Epsilor’s new battery hits all three with its NATO-standard 6T footprint, MIL-PRF certification efforts, and record-high 4,400Wh energy rating.
There is also growing interest in the lithium-iron phosphate segment, where Epsilor’s COMBATT ELP series offers a safer, albeit less energy-dense, path for integration into command vehicles and secondary systems.
Given the broader shift toward electrified military logistics, investors may begin evaluating firms like Epsilor not just on product margins—but also on their potential to contribute to decarbonization and battlefield readiness strategies across NATO and allied theaters.
Will Epsilor’s high-capacity 6T battery redefine battlefield energy logistics?
Epsilor’s unveiling of the COMBATT ELI-52526-GM battery marks a significant milestone in the evolution of defense-grade energy storage systems. With its unprecedented 4,400Wh capacity, compliance push, and alignment with MIL-PRF-32565C safety benchmarks, the Israeli-American battery manufacturer is positioning itself as a global contender in military electrification.
As vehicle electrification, autonomous defense systems, and modular energy deployments become increasingly central to 21st-century defense planning, energy-dense, safe, and certifiable battery systems like Epsilor’s 6T range could become foundational to procurement frameworks worldwide.
With DSEI UK 2025 set to serve as a critical visibility platform, the next phase will likely hinge on procurement adoption, certification closure, and OEM integrations—signals that defense and energy observers will be watching closely.
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