Graphene Manufacturing Group (GMG) has released test data showing that its fast-charging G CELLS completed 1,000 six-minute charge and discharge cycles with no performance reduction as of October 7, 2026.

Indiana’s Battery Innovation Center built the 1.5 Ah pouch cells and collected the data. GMG developed, manufactured and supplied the graphene materials in the cells from its Brisbane Battery Development Centre.

G CELLS are graphene aluminum-ion cells that use no lithium or rare earth materials. GMG is developing the technology under a joint development agreement with Rio Tinto.

The cells were charged and discharged at a 7 C rate. GMG says the cycle count is double that in its previous update, which covered cells cycled at 10 C. A lithium titanate oxide (LTO) cell charged and discharged in the same six minutes, at 10 C, fell to 80% of its original capacity within 82 cycles. That level is typically treated as a cell’s end of life. A second G CELL, also charged and discharged in six minutes at 10 C, showed a 10% performance reduction after 393 cycles.

Specific energy reached 58 Wh/kg at a six-minute (10 C) charge, a 48% increase over the 39 Wh/kg in GMG’s previous update. The G CELLS also showed 94% energy efficiency at the six-minute charge and discharge rate, compared with 64% for the LTO cell.

“Energy that isn’t lost as heat is what makes fast charging practical at the system level,” said Bob Galyen, a GMG Director and former Chief Technology Officer of CATL.

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