Fast-charging G CELLS from Graphene Manufacturing Group (GMG) have run 489 charge and discharge cycles without measurable capacity loss, according to test data collected by the Battery Innovation Center of Indiana (BIC) and current as of September 4, 2026. The 1 Ah pouch cells were charged and discharged within six minutes for each cycle, at a 10 C rate in both directions.
BIC built the test cells itself, using graphene materials that GMG developed, manufactured and supplied from its Brisbane Battery Development Centre. The work falls under a joint development agreement between GMG and Rio Tinto.
GMG’s product page describes G CELLS as graphene aluminum-ion cells that use no lithium or rare earth materials, and says they are designed to be interchangeable with lithium-ion battery applications.
A lithium titanate oxide (LTO) cell put through the same profile fell to 86% of its original capacity within 64 cycles. GMG puts the difference at more than seven times the cycle life under identical testing.
Internal resistance of the G CELLS measured around 5 mΩ, against up to 30 mΩ for the LTO cell. Lower resistance means less resistive heating at a given current. The G CELLS ran 4° C above ambient during testing, and the LTO cells ran 19° C above it.
GMG reports specific energy lower than it has previously reported. The company describes the cells as unoptimized and expects to bring the figure back to around 50 Wh/kg at the same charge rate after further optimization.
Voltage stayed close to flat across roughly 80% of the discharge, which GMG says makes constant-power discharge easier to control.
“Having built and scaled battery manufacturing for the world’s largest lithium-ion producer, I know how rare it is to see this combination of fast-charge durability and thermal control this early in a cell’s development,” said Bob Galyen, GMG Director and former Chief Technology Officer of CATL. “There is clear further work ahead on some of the energy density optimisation and further scaling of the cell size, but the fundamentals being demonstrated here are the right ones to be solving first.”
Source: Graphene Manufacturing Group
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