Graphene battery technology is an area of ongoing research and development, and there are several companies and research institutions working on utilizing graphene's unique properties to improve battery performance. Keep in mind that the information.  and there may have been developments in the field since then. Here are some companies that have been involved in graphene battery research and development:

1. **StoreDot**: StoreDot, an Israeli startup, is known for its work on fast-charging batteries. They have integrated graphene into lithium-ion batteries to significantly reduce charging times. Their research focuses on creating high-performance batteries for various applications.

2. **Nanotech Energy**: Nanotech Energy, a U.S.-based company, specializes in graphene-infused materials for batteries and supercapacitors. They aim to develop high-capacity graphene battery companies and fast-charging graphene batteries for a wide range of applications, including consumer electronics and electric vehicles.

3. **ZapGo**: ZapGo, a UK-based company, focuses on graphene supercapacitors. They aim to replace traditional lithium-ion batteries with graphene-based supercapacitors that can charge rapidly and have a longer lifespan.

4. **Graphene Batteries**: This Swedish company is dedicated to researching and developing graphene-based batteries. They aim to create batteries with improved energy density, longer cycle life, and faster charging times.

5. **Skeleton Technologies**: Skeleton Technologies, based in Estonia, focuses on ultracapacitors and graphene-based energy storage solutions. While ultracapacitors are not traditional batteries, they offer rapid charge and discharge capabilities suitable for many applications.

6. **Vorbeck Materials**: Vorbeck Materials, a U.S.-based company, specializes in graphene-based materials and technologies, including batteries and conductive inks. Their research has applications in flexible and wearable electronics.

7. **Samsung**: Samsung, a major global electronics company, has invested in graphene research for battery technology. They aim to improve battery performance and longevity using graphene.

8. **Academic and Research Institutions**: Numerous universities and research centers worldwide are actively engaged in graphene battery research, often in collaboration with industry partners. These institutions contribute to advancing the understanding of graphene's potential in battery technology.

Please note that the graphene battery industry is still in its research and development phase, and commercial products may not yet be widely available. Companies working in this field continue to conduct research, test prototypes, and seek ways to scale up production for future commercialization. It's essential to keep up with the latest developments in this field to identify emerging graphene battery technologies and companies.