Mullen Partners with Enpower Greentech to Develop Semi-Solid-State Batteries for Commercial Vehicles

Mullen, an energy technology and electric vehicle (EV) manufacturer, has partnered with Enpower Greentech (EGI) to develop semi-solid-state batteries (SSBs) for commercial vehicles. The partnership aims to bring high-performance, cost-efficient, and environmentally friendly battery solutions to the market. The partnership will see Mullen integrate EGI’s SWIFT Series SSB Cells into its existing SSB program at its Battery Center in Fullerton, California. The Fullerton facility has three lines for the manufacture of lithium-iron-phosphate (LFP) battery modules and will continue to ramp up its engineering staff to execute this technology in early 2026. “By partnering with EGI, Mullen continues to build its portfolio and is positioned to deliver domestically produced battery solutions, which has been Mullen’s vision since its inception,” said John Taylor, president of Commercial Vehicles and SVP Global Manufacturing at Mullen. Mullen’s Fullerton facility currently has three battery lines installed in support of U.S.-made battery components and manufacturing. Lines include:

High volume standard battery chemistry line.
Low volume standard chemistry R&D line.
Low volume solid-state polymer R&D line.

Mullen has long been advancing a semi-solid-state battery solution and has worked on other initiatives with EGI for the past 18 months. The production of EGI SWIFT batteries is slated to begin early 2026. EGI’s SWIFT Series SSB Cells are advanced silicon-anode-based semi solid-state batteries. They offer twice the energy density, ultra-fast charging capability, extended cycle life, and a cost-efficient manufacturing roadmap. Top U.S. automotive OEMs, leading drone manufacturers, and eVTOL companies have widely tested and validated SWIFT cells. EGI plans to commence domestic manufacturing in late Q3 2025 at its Ann Arbor, Michigan, facility, which will continue to expand its manufacturing capacity throughout 2026. Mullen and EGI are committed to delivering high-performance, cost-efficient, and environmentally friendly battery solutions to the market. The partnership will reduce supply chain vulnerabilities and address increased costs due to tariffs. “The synergies that exist between the two companies have evolved into understanding the full technology, and the ripple of this technology will be monumental to the industry,” said Dr. Che Yong, co-founder and CTO of EGI. “We are excited to sign this agreement to solidify our continued relationship with Mullen in this critical growth market,” Dr. Che Yong added. Mullen’s production of EGI SWIFT batteries is expected to begin early 2026. The company will integrate the EGI SWIFT battery into its existing SSB program in Fullerton, California. **Benefits of the Partnership**
* High-performance battery solutions
* Cost-efficient manufacturing roadmap
* Environmentally friendly battery solutions
* Reduced supply chain vulnerabilities
* Addressed increased costs due to tariffs
**Key Players**
* Mullen Automotive Inc. (NASDAQ: MULN)
* Enpower Greentech Inc. (EGI)
* John Taylor, president of Commercial Vehicles and SVP Global Manufacturing at Mullen
* Dr. Che Yong, co-founder and CTO of EGI
**About Enpower Greentech**
Enpower Greentech Inc. (EGI) is a global leader in advanced lithium-ion battery research and manufacturing. The company has a clear manufacturing roadmap with product solutions for drones, two-wheelers, EVs, E-Aviation and robotics markets. By leveraging its dual technology platforms with semi-solid and all-solid-state batteries, EGI provides batteries with industry-leading energy density, long cycle life and high safety. **About Mullen**
Mullen Automotive (NASDAQ: MULN) is a Southern California-based automotive company building the next generation of commercial electric vehicles (“EVs”) with two United States-based vehicle plants located in Tunica, Mississippi, (120,000 square feet) and Mishawaka, Indiana (650,000 square feet). In August 2023, Mullen began commercial vehicle production in Tunica. As of January 2024, both the Mullen ONE, a Class 1 EV cargo van, and Mullen THREE, a Class 3 EV cab chassis truck, are California Air Resource Board (“CARB”) and EPA certified and available for sale in the U.S. **Conclusion**
The partnership between Mullen and EGI marks a significant step forward in the development of semi-solid-state batteries for commercial vehicles. With the production of EGI SWIFT batteries expected to begin early 2026, Mullen and EGI are committed to delivering on their promise of delivering high-quality battery solutions to the market.