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Graphene Manufacturing Group says its G CELLS completed 1,000 charge-and-discharge cycles, each taking six minutes, with no performance reduction reported as of October 7, 2026. The 1.5 Ah pouch cells were tested at a 7C rate by Indiana’s Battery Innovation Center; the results are company-released test data, not evidence of commercial-scale performance.
Graphene Manufacturing Group says its G CELLS completed 1,000 six-minute charge-and-discharge cycles with no performance reduction reported as of October 7, 2026. The 1.5 amp-hour pouch cells were tested at a 7C rate by Indiana’s Battery Innovation Center, in a result relevant to the company’s effort to develop batteries capable of rapid charging.
The Battery Innovation Center built the pouch cells and collected the test data. GMG said it developed, manufactured and supplied the graphene materials used in the cells through its Brisbane Battery Development Centre. The company describes G CELLS as graphene aluminum-ion cells that use no lithium or rare-earth materials.
The reported 1,000-cycle result concerns cells operated at 7C. GMG said this is twice the cycle count in its previous update, which covered cells tested at a 10C rate. The update also reports separate measurements at 10C: a G CELL retained performance to within a 10% reduction after 393 cycles, while a lithium titanate oxide (LTO) comparison cell reached 80% of its original capacity within 82 cycles. GMG describes 80% capacity as a level typically treated as end of life.
At a six-minute, 10C charge, GMG reported specific energy of 58 watt-hours per kilogram, up from 39 Wh/kg in its prior update. It also reported 94% energy efficiency for a G CELL charged and discharged at that rate, compared with 64% for the LTO cell. These are figures disclosed by GMG; the supplied report does not provide a full test protocol or independent verification.
Fast Charging Meets Cycle Life
Fast charging can reduce the time electric-vehicle users spend plugged in and could matter for energy-storage systems that need frequent cycling. But charging quickly is useful only if a cell can withstand repeated use and limit energy lost as heat. GMG’s reported combination of six-minute cycling and 1,000 cycles addresses those two concerns in a small pouch-cell test.
The reported efficiency comparison also points to a potential system-level consideration. Bob Galyen, a GMG director and former chief technology officer of CATL, said that energy not lost as heat is what makes fast charging practical at the system level. The figures do not establish that the cells are ready for vehicles or grid storage: the tested capacity was 1.5 Ah, and performance in larger cells and complete battery packs may differ.
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Earlier Tests and Development
GMG is developing the G CELLS under a joint development agreement with Rio Tinto. Its previous public update, as described in the current report, covered cells cycled at 10C and recorded a lower cycle count. GMG’s latest headline result uses a 7C rate, while the report separately gives 10C results for specific energy, efficiency and comparisons with LTO cells.
Those test conditions should not be conflated. The 1,000-cycle figure is not a 1,000-cycle result at 10C, and the 393-cycle G CELL result and 82-cycle LTO comparison relate to tests at 10C. The source does not give enough detail to compare every test variable or establish that the cells were tested under identical conditions beyond the stated charge-and-discharge time and rate.
“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
Scale-Up and Test Details
The figures are company-reported test results. The source material does not specify the number of cells tested, the full testing protocol, measurement tolerances, or whether an independent party reviewed the results. It also does not clarify precisely how “no performance reduction” was measured across the 1,000 cycles.
Commercial readiness remains unestablished. The tested cells were 1.5 Ah pouch cells, and no production timeline, manufacturing capacity, cost, pack-level results or vehicle validation was provided. GMG’s comparison with LTO cells is limited to the reported test conditions; the available information does not establish performance across other battery chemistries or use cases.
GMG Targets Larger Cell Formats
GMG says it plans to continue working on energy density and 10C cycle life and to scale the technology to larger cell formats. The company has not announced a specific timetable or named a next test milestone in the source material. Further updates would be needed to show whether the reported results persist in larger cells and under independently described, application-relevant testing.
Key Questions
What did GMG report?
GMG said its G CELLS completed 1,000 six-minute charge-and-discharge cycles with no performance reduction reported as of October 7, 2026. The cells were cycled at 7C.
Who tested the cells?
Indiana’s Battery Innovation Center built the 1.5 Ah pouch cells and collected the data. GMG supplied the graphene materials used in them.
Was the 1,000-cycle result achieved at 10C?
No. The reported 1,000-cycle test was conducted at 7C. GMG separately reported 10C results, including a 393-cycle G CELL test and specific-energy and efficiency measurements.
Are the cells ready for electric vehicles?
The reported data do not establish that. The test used 1.5 Ah pouch cells, and the source gives no commercial production schedule, vehicle validation or pack-level results.
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