The British company RML Group has received approval to mass-produce its revolutionary VarEVolt electric vehicle battery, which boasts the world's highest power density and can fully recharge in just 18 seconds, marking a significant advancement in EV technology that could dramatically reduce charging times compared to conventional batteries.
The VarEVolt battery pack stands out in the automotive world with its extraordinary 200C charging rate capability, which enables its remarkable 18-second full charging time.12 This game-changing technology delivers an impressive power density of 6 kW per kilogram, making it the most power-dense battery in the automotive industry according to RML Group.234
The high-performance battery module has already proven its capabilities in demanding environments, including testing at the Nürburgring racing circuit.5 As part of RML Group's 40th anniversary product launches, the VarEVolt battery showcases the company's versatility and engineering prowess beyond their traditional automotive projects like the RML Short Wheel Base and road-converted Aston Martin Vulcan.5 This revolutionary battery technology represents a significant leap forward in addressing one of the most persistent barriers to EV adoption—charging time—while maintaining exceptional power output capabilities.
On June 2, 2025, RML Group achieved a significant milestone when it was granted Conformity of Production (CoP) certification for its VarEVolt battery systems following a rigorous audit by UCA, an independent certification body.12 This certification confirms that RML's quality management systems consistently produce products that comply with UN ECE Regulation 100, the key safety standard for electrified powertrain components.34 The approval represents the first-ever CoP certification for an RML product and positions the company to transition from prototyping to reliable mid-volume production.4
The certification is a crucial step in RML's strategy to homologate its VarEVolt battery platform and distinguishes the company from smaller EV startups.15 According to James Arkell, Head of Powertrain at RML Group, this achievement "underlines our readiness to move from prototyping and niche volumes to supporting larger production contracts."62 Founded in 1984 by Ray Mallock, RML Group has a proven track record in high-performance engineering, including developing the battery and carbon fiber chassis for the NIO EP9 hypercar that previously held the Nürburgring EV lap record.5
The VarEVolt battery's groundbreaking 6 kilowatts per kilogram power density sets a new benchmark in the automotive sector, enabling it to deliver massive amounts of energy almost instantaneously when needed.12 This exceptional power-to-weight ratio allows the battery to discharge its entire energy reserve in extremely short timeframes, as demonstrated in the Czinger C21 hybrid hypercar where it dissipated 4.5 kWh in just 40 seconds.2 To put this performance in perspective, conventional EV batteries like those in the Tesla Model S typically weigh around 5.4-7.7 kg per kWh,3 while the VarEVolt's power delivery capabilities are more akin to "comparing a gentle countryside stream to Niagara Falls in full flow."1
The battery's modular design allows it to be adapted for different power and capacity requirements, making it particularly valuable for hybrid hypercars where extreme, rapid energy discharge is essential.24 This versatility positions RML Group to not only supply next-generation vehicles but also offer modernization kits for existing high-performance cars, potentially transforming the hypercar market with a solution that addresses both performance demands and the traditionally lengthy recharge times that have limited EV adoption in ultra-high-performance applications.2
