Each ES10M marine battery module stores 9.8 kWh, and Unipart will support manufacture of the system under the new partnership
(Image courtesy of Williams Grand Prix Technologies)
Unipart has formed a strategic partnership with Williams Grand Prix Technologies (WGPT) to support manufacture of the ES10M marine battery system, with defence and marine applications as the primary focus. The agreement gives a battery launched in July for superyachts and explorer vessels a route towards volume manufacturing through Unipart’s automotive-grade production capacity, and it builds on Hyperbat, the UK battery system manufacturer Unipart took into full ownership in January 2026.
What each partner brings to the marine battery
WGPT contributes motorsport-derived expertise in high-performance engineering, energy systems and physics-informed machine learning, while Unipart adds manufacturing and supply chain capability, including full-scale battery production. The two British companies describe an end-to-end industrialisation pathway for sectors moving to hybrid and fully electric propulsion to meet emissions standards, tactical quiet-running mandates and high-reliability operating requirements.
WGPT designs safety-critical battery architectures, such as class-compliant maritime systems, and Unipart supplies the production capacity to take those designs from prototype to volume. Selin Tur, WGPT’s Managing Director and Chief Technology Officer, says taking Formula 1-grade energy storage design through to scaled commercial manufacturing has historically been a major hurdle, and that the partnership lets WGPT offer its engineering, simulation intelligence and machine-learning control systems alongside Unipart’s certified manufacturing and supply chain infrastructure.
ES10M marine battery specifications and safety architecture
Each ES10M module stores 9.8 kWh at 50.4 V and weighs 48.8 kg, with energy density of 200 Wh/kg gravimetric and 325 Wh/l volumetric. Modules combine into systems from 39 kWh across roughly 200 V to 900 V, so the same architecture covers compact single-rack installations on yachts of around 50 metres and multi-bank arrangements in dedicated battery spaces on vessels above 100 metres.
At cell level, thermal grade materials and the selected cell format limit propagation between cells, and an integrated gas management system vents gas in a controlled way during abnormal conditions. The battery management system uses physics-informed machine learning to monitor cell and module performance and anticipate faults, which WGPT says supports class-mandated safety case requirements, and a supervisory controller can isolate individual battery strings. Modules carry an IP67 ingress rating and a design to maritime-grade EMI/EMC standards, and Lloyd’s Register class compliance is in progress.
Hyperbat links the partners
Carol-Rose Burke CBE, Unipart’s Managing Director for Design, Manufacturing and Engineering, calls the WGPT agreement a natural evolution of the close relationship built on Hyperbat’s foundations. Hyperbat began in 2018 as a joint venture between Unipart Manufacturing Group and Williams Advanced Engineering. Unipart acquired the remaining 50% shareholding in January 2026 and now owns a UK platform for battery systems, power electronics, power modules and electrical integration, with lifecycle services that include manufacture and remanufacture.
Burke frames the partnership as a step toward accelerating sovereign UK electrification capability, one that lets Unipart industrialise advanced energy concepts for defence and marine customers moving to low-carbon technologies.
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