Graphene Manufacturing Group's fast-charging battery cells show no performance loss

Energy Renewable Energy Written by: Angela Harmantas 09:43 Wed 09 Sep 2026 --> Disclaimer No investment advice About this content Editorial Standards & Policies Share article About this content × About Angela Harmantas Angela Harmantas is an Editor at Proactive. She has over 15 years of experience covering the equity markets in North America, with a particular focus on junior resource stocks. Angela has reported from numerous countries around the world, including Canada, the US, Australia, Brazil, Ghana, and South Africa for leading trade publications. Previously, she worked in investor relations and led the foreign direct investment program in Canada for the Swedish government. She earned a Bachelor of... Read more About the publisher Proactive financial news and online broadcast teams provide fast, accessible, informative and actionable business and finance news content to a global investment audience. All our content is produced independently by our experienced and qualified teams of news journalists. Proactive news team spans the world’s key finance and investing hubs with bureaus and studios in London, New York, Toronto, Vancouver, Sydney and Perth. We are experts in medium and small-cap markets, we also keep our community up to date with blue-chip companies, commodities and broader investment stories. This is content that excites and engages motivated private investors. The team delivers news and unique insights across the market including but not confined to: biotech and pharma, mining and natural resources, battery metals, oil and gas, crypto and emerging digital and EV technologies. Use of technology Proactive has always been a forward looking and enthusiastic technology adopter. Our human content creators are equipped with many decades of valuable expertise and experience. The team also has access to and use technologies to assist and enhance workflows. Proactive will on occasion use automation and software tools, including generative AI. Nevertheless, all content published by Proactive is edited and authored by humans, in line with best practice in regard to content production and search engine optimisation. Graphene Manufacturing Group Ltd ( TSX-V:GMG OTCQX:GMGMF ) View Price & Profile Graphene Manufacturing Group's fast-charging battery cells show no performance loss Published: 09:43 09 Sep 2026 EDT Graphene Manufacturing Group Ltd (TSX-V:GMG, OTCQX:GMGMF) said its fast-charging GCELLS have shown no reduction in performance after 489 charge cycles, each completed within six minutes, in the latest data from its battery development program with Rio Tinto. The cycling data, collected by the Battery Innovation Center of Indiana on 1 Ah cells built with materials developed and supplied by GMG's Brisbane Battery Development Centre, compared the GCELLS against a well-known Lithium Titanate Oxide battery tested under the same charging profile. The LTO cell degraded to 86% of its original capacity, near the industry's typical 80% end-of-life threshold, within just 64 cycles. GMG said its cells have effectively lasted more than seven times longer than the LTO comparison under identical testing conditions. Craig Nicol, CEO of GMG, said the data is an important proof point for the program, showing GCELLS can be repeatedly fast-charged with no measurable degradation, well beyond where the LTO comparison reached end of life. “Energy density is an area we are continuing to optimise, and we are confident, based on the pathway BIC and our own team have identified, that we can lift this back towards 50 Wh/kg at a 10C charge rate as this program matures.” Bob Galyen, GMG director and former chief technology officer of CATL, called the cycling stability "genuinely exceptional," noting the low internal resistance of around 5 mOhms and a 4 degree temperature rise above ambient show the material science is translating into real cell-level performance. Jack Perkowski, chairman of GMG, said that BIC's independently measured data gives the board confidence in the program's direction as management works through the optimisation steps ahead. The work is being carried out under a Joint Development Agreement between GMG and Rio Tinto, one of the world's largest metals and mining groups, with support from the Battery Innovation Center of Indiana in the United States. Continue reading