Graphene Manufacturing Group (TSX-V:GMG) has reported no measurable capacity loss after 489 charge-discharge cycles in tests of its graphene batteries, alongside an expansion of its Asia Pacific sales presence.
The company’s 9 September update details testing by the Battery Innovation Center in Indiana, US, using one-ampere-hour cells manufactured with materials supplied by GMG’s Brisbane Battery Development Centre.
The G®CELLS underwent six-minute charging and six-minute discharging. Results recorded as of 4 September showed no measurable degradation.
A lithium titanate oxide comparison cell retained 86% of its original capacity after 64 cycles under the same testing profile. That remains above the 80% capacity threshold typically used to define a battery’s end of life.
GMG also reports a temperature rise of 4°C above ambient during testing, compared with 19°C for the comparison cell.
The battery program operates under a joint development agreement with Rio Tinto (ASX:RIO). Further work includes improving energy density and increasing cell size, with GMG targeting around 50 watt-hours per kilogram following optimisation.
Separately, the company also announced a dedicated sales team on 8 September, with representatives in India, South Korea, Japan, and Singapore, alongside its Australian team.
GMG says these representatives have been engaging customers and distribution partners since early 2026 across thermal management, lubricant, and energy storage applications.
GMG is an Australian technology company producing graphene from natural gas for coatings, additives, and batteries.
Write to France Pinzon at Mining.com.au
Images: Graphene Manufacturing Group
