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Graphene Manufacturing Group says G CELL pouch cells completed 1,000 charge-and-discharge cycles, with each cycle taking six minutes, without a measured performance reduction. The test used 1.5 Ah cells at a 7C rate; GMG says it is continuing work on energy density, 10C cycle life and larger formats.
Graphene Manufacturing Group says its G CELL pouch batteries completed 1,000 charge-and-discharge cycles, with each cycle taking six minutes, without a measured performance reduction. The test used cells charged and discharged at a 7C rate; the result is a company-reported laboratory finding, not evidence that the cells are ready for commercial electric vehicles.
Indiana’s Battery Innovation Center built the 1.5 amp-hour pouch cells and collected the test data. GMG says it developed, manufactured and supplied the graphene materials used in the cells through its Brisbane Battery Development Centre. The company reported the results as of October 7, 2026.
GMG describes G CELLS as graphene aluminum-ion batteries that use no lithium or rare-earth materials. It said the 1,000-cycle count is double the count in its previous update, which concerned cells tested at a faster 10C rate. The current result and the earlier test should not be treated as identical conditions: the reported 1,000 cycles were at 7C.
GMG also reported separate results from six-minute tests at 10C. A G CELL reached 58 watt-hours per kilogram of specific energy, up from 39 Wh/kg in the company’s previous update, and recorded 94% energy efficiency. GMG compared the efficiency with 64% for a lithium titanate oxide cell tested at the same six-minute charge-and-discharge duration. In another comparison, GMG said an LTO cell reached 80% of its original capacity after 82 cycles, while a G CELL tested at 10C showed a 10% performance reduction after 393 cycles.
What the Cycle Results Could Mean
Fast charging can be limited not only by how quickly a battery accepts energy, but also by how much capacity and energy are lost over repeated use. GMG’s reported cycle-life and efficiency measurements address two factors that would matter if the cells were developed for vehicles or energy storage. The reported 94% efficiency, if reproduced under comparable conditions, would mean less energy lost during the tested charge-and-discharge process than in the LTO comparison cell.
The findings remain laboratory test results from small 1.5 Ah pouch cells. They do not establish how a larger battery pack would perform, how much it would cost, or whether the technology could meet vehicle requirements for power, safety and durability. The difference between the 7C test and the separate 10C tests also matters: results at one rate cannot automatically be applied to the other.
GMG’s results may attract interest because the company is developing the technology with Rio Tinto under a joint development agreement. But a long cycle test by itself does not establish commercial readiness. Larger formats and further testing are needed before the results can show whether the cells are practical at system scale.
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Earlier Tests and Development Plans
The reported 1,000-cycle result follows an earlier GMG update that covered cells cycled at 10C. GMG says the new cycle count is twice that in the prior update, while the new test was conducted at 7C. These different rates describe distinct test conditions, so the reported counts are not a direct like-for-like comparison of the cells’ performance at one fixed rate.
GMG’s 10C data include the specific-energy and efficiency figures, as well as comparisons with an LTO cell. The company said the LTO cell fell to 80% of original capacity after 82 cycles, a level commonly treated as an end-of-life threshold. GMG also reported a 10% performance reduction in a separate G CELL after 393 cycles at 10C. These are company-reported test findings; the source material does not provide a full independent assessment of the protocols or results.
The company is developing G CELLS under a joint development agreement with Rio Tinto. GMG says its current priorities are to improve energy density and cycle life at 10C, and to scale the cells to larger formats. Those development goals indicate that the present results are part of ongoing testing, rather than a product launch announcement.
“Energy that isn’t lost as heat is what makes fast charging practical at the system level.”
— Bob Galyen, a GMG director and former chief technology officer of CATL
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Limits of the Reported Testing
The available report does not establish independent replication of the results or provide enough detail to assess every aspect of the test protocol. It also does not specify how performance was measured in the 1,000-cycle test, beyond GMG’s statement that there was no reduction. The result should be understood as a reported outcome for the tested cells, not a guarantee of performance in other cells or operating conditions.
It remains unclear when G CELLS could reach commercial production, what larger-format performance would be, or how the technology would compare on cost and safety with established battery chemistries. GMG’s 7C cycle result should also be distinguished from its separate 10C measurements; the source does not report 1,000 cycles at 10C.
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GMG’s Next Testing Milestones
GMG says it plans to keep working on energy density and 10C cycle life, while scaling the technology to larger cell formats. The source material does not give a timetable for those milestones or name a planned commercial launch date.
Further updates would help clarify whether the laboratory results can be reproduced in larger cells and how performance changes under broader operating conditions. Until those details are reported, the 1,000-cycle result remains a company-reported test finding, rather than proof of commercial-scale battery performance.
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Key Questions
What did GMG report about its G CELLS?
GMG reported that its 1.5 Ah G CELL pouch cells completed 1,000 six-minute charge-and-discharge cycles at a 7C rate without a measured performance reduction.
Were the 1,000 cycles tested at 10C?
No. The reported 1,000-cycle result was at 7C. GMG’s separate six-minute measurements at 10C included specific energy, efficiency and comparisons with an LTO cell.
How did the G CELL compare with the LTO cell?
GMG said an LTO cell tested at 10C 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 company-reported results from the stated tests.
Are G CELLS ready for electric vehicles?
The reported data do not establish that. The tests used 1.5 Ah pouch cells, and GMG says it is still working on larger formats, energy density and 10C cycle life. The source gives no commercial production timetable.
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