Graphene Manufacturing Group (GMG) has released new third-party cycling data on its fast-charging G®CELLS graphene battery technology, developed under GMG's Joint Development Agreement with mining giant Rio Tinto and with support from the Battery Innovation Center of Indiana (BIC) in the United States.
Testing conducted by BIC on 1 Ah G®CELLS - built by BIC using materials developed, manufactured, and supplied by GMG at its Brisbane Battery Development Centre - reportedly showed no measurable capacity fade after 489 charge-discharge cycles as of September 4, 2026, despite each full cycle (10C charge, 10C discharge) completing in just six minutes. By comparison, a benchmark lithium titanate oxide (LTO) cell, cycled under the same profile, degraded to 86% of its original capacity - near the industry-standard 80% end-of-life threshold - within just 64 cycles. That puts the G®CELLS' demonstrated cycle life at more than seven times that of the LTO benchmark.
The G®CELLS also showed markedly flatter voltage and capacity curves through roughly 80% of each discharge compared to the LTO cell, a property useful for constant-power discharge applications. On resistance and thermal performance, the G®CELLS measured internal resistance of about 5 mOhms, versus up to 30 mOhms for the LTO cell, translating to a temperature rise of just 4°C above ambient during high-speed charging, compared to 19°C for the LTO cell. Energy density came in at 39 Wh/kg under the 10C/10C test - lower than previously reported figures, which GMG attributes to the cells being unoptimized at this stage, with a target of returning to around 50 Wh/kg after further optimization.
"The cycling stability we are seeing from these G®CELLS is genuinely exceptional," said Bob Galyen, GMG Director and former Chief Technology Officer of CATL. "Sustaining zero measurable capacity fade past 489 cycles under a full 10C charge and 10C discharge regime... is a result that stands in stark contrast to the LTO benchmark cell, which is regarded as one of the most robust fast-charging chemistries on the market today and still degraded to end-of-life within 64 cycles under the same profile." GMG CEO and Managing Director Craig Nicol added that fast charging "is one of the biggest barriers to broader electric vehicle and energy storage adoption," while Chairman Jack Perkowski pointed to BIC's decade of experience and more than 500 battery development projects as grounds for the Board's confidence in the program.
The battery update lands alongside a broader commercial push at GMG: the company also recently launched a dedicated Asia Pacific sales team, targeting India, South Korea, Japan, and Singapore in addition to its existing Australian operations, with further expansion into South-East Asia and New Zealand planned. The expansion spans GMG's three core product lines - thermal management (THERMAL-XR), lubricant additives (G LUBRICANT), and energy storage - and follows closely on other recent milestones, including the completion of GMG's Gen 2.0 graphene production plant and the launch of G FLUID, a graphene-based data-center coolant additive. "The launch of our dedicated Asia Pacific Sales Team marks an important step in GMG's global commercialization strategy," Nicol said of the expansion.
