GMG Reports 1,000 Six-minute Charge Cycles For Its Graphene G CELLS

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Graphene Manufacturing Group says 1.5 Ah G CELL pouch cells completed 1,000 charge-and-discharge cycles, each taking six minutes, at a 7C rate with no reported performance reduction as of October 7, 2026. The data were collected by Indiana’s Battery Innovation Center; larger-format testing and commercial readiness remain unresolved.

Graphene Manufacturing Group says its G CELL pouch batteries completed 1,000 six-minute charge-and-discharge cycles at a 7C rate with no performance reduction reported as of October 7, 2026. The results, collected by Indiana’s Battery Innovation Center, add durability data for GMG’s graphene aluminum-ion cells, which the company is developing with Rio Tinto.

The Battery Innovation Center built the 1.5 amp-hour pouch cells and collected the cycling data. GMG developed, manufactured and supplied the graphene materials from its Brisbane Battery Development Centre. The cells were charged and discharged at a 7C rate, a measure of charge or discharge speed relative to a cell’s capacity. GMG’s report says the cells had completed 1,000 cycles without a performance reduction by the stated date.

GMG said the reported cycle count is double the count in its previous update, which covered cells cycled at 10C. The latest 1,000-cycle result and the earlier 10C tests are separate test conditions, so their cycle counts should not be treated as a direct comparison of identical tests.

The company also reported results from six-minute tests at 10C. A G CELL reached a specific energy of 58 watt-hours per kilogram, up from 39 Wh/kg in GMG’s previous update, and recorded 94% energy efficiency. GMG compared that efficiency with 64% for a lithium titanate oxide cell tested at the same six-minute charge-and-discharge duration. In another comparison, the LTO cell reached 80% of its original capacity after 82 cycles; GMG says a separate G CELL at 10C showed a 10% performance reduction after 393 cycles.

Fast Charging Meets Cycle-Life Testing

Fast charging can reduce the time vehicles or energy-storage systems spend connected to a charger, but speed alone does not show whether a battery can withstand repeated use. The reported 1,000 cycles at six minutes per cycle provide an early durability measure under a stated test condition. If results can be reproduced in larger cells and practical operating environments, they could help assess whether the technology has a role in applications where rapid charging and repeated cycling matter.

The comparisons also point to separate performance questions. GMG’s reported 94% energy efficiency at 10C concerns how much energy is retained through charging and discharging, while cycle-life results concern change over repeated cycles. Those results are company-reported laboratory data, not proof of vehicle performance or commercial-scale economics. They do not establish charging behavior across a full battery pack, under varying temperatures, or with the constraints of a real charging system.

GMG CEO and Managing Director Craig Nicol said fast charging remains a barrier to wider electric-vehicle and energy-storage adoption. The reported testing is relevant to that challenge, but the next steps—improving energy density and 10C cycle life and scaling cell formats—show that development is still underway.

GMG’s Cell Development and Test Comparisons

GMG describes G CELLS as graphene aluminum-ion batteries that use no lithium or rare-earth materials. The company is developing the technology under a joint development agreement with Rio Tinto. The materials for the tested cells came from GMG’s Brisbane Battery Development Centre, while the Battery Innovation Center in Indiana built the pouch cells and gathered the data.

The latest cycle-life figure uses a 7C test rate; other reported results use 10C. GMG’s comparisons include an LTO cell tested over the same six-minute charge-and-discharge duration, but the supplied report does not establish that all cells were tested under every other identical condition. The reported figures are therefore test results, not a broad, independent comparison of battery technologies.

“Energy that isn’t lost as heat is what makes fast charging practical at the system level.”

— Bob Galyen, GMG director and former chief technology officer of CATL

Questions Beyond the Pouch-Cell Results

The reported results do not specify a target date for commercial production, the expected price of G CELLS, or when larger-format testing will be completed. The supplied account also does not provide full test protocols, cell-to-cell variation, temperature conditions, or independent replication of the results. It is not clear how the 1,000-cycle result at 7C would translate to a finished battery pack or a vehicle or storage system.

GMG’s statements describe company-reported test data. The 1,000-cycle finding applies to the tested cells and stated conditions; it does not establish performance across all G CELLS or prove that the technology is ready for commercial use. The company’s comparison with LTO cells should also be read with the reported test rates and performance measures in view, rather than as a universal ranking of the two technologies.

Larger Cells and 10C Durability

GMG says it plans to keep working on energy density and 10C cycle life and to scale the technology to larger cell formats. The company’s next development updates and test data will show whether results from 1.5 Ah pouch cells can be repeated at larger sizes. No specific timeline for those milestones was provided in the source report.

Further information on test methods, independent validation, and performance under application-level conditions would help clarify how the results could translate beyond laboratory cells. Until such data and a commercialization plan are available, the reported figures remain an early-stage indicator rather than a demonstrated product specification.

Key Questions

What did GMG report?

GMG reported that its 1.5 Ah G CELL pouch cells completed 1,000 six-minute charge-and-discharge cycles at 7C with no performance reduction reported as of October 7, 2026. The Battery Innovation Center built the cells and collected the data.

What is a G CELL?

GMG describes G CELLS as graphene aluminum-ion cells that use no lithium or rare-earth materials. The company is developing them under a joint development agreement with Rio Tinto.

How did the G CELL results compare with the LTO test?

GMG reported that an LTO cell tested over the same six-minute charge-and-discharge duration fell to 80% of its original capacity after 82 cycles. A separate G CELL tested at 10C showed a 10% performance reduction after 393 cycles. These are reported test results, not a universal comparison across all cells or conditions.

Are G CELLS ready for commercial use?

The reported results do not establish commercial readiness. GMG says it is still working to improve energy density and 10C cycle life and to scale to larger cell formats; the source report gives no production timeline.

Source: rss