FinDreams Battery, the battery arm of BYD, has reached a cooperation agreement with Changsha Fusheng Technology. The two will work together on Blade Battery systems intended for rail locomotives deployed in industrial and mining settings. A company announcement said the deal was signed on Sept. 7 at BYD’s Pingshan headquarters in Shenzhen.

The collaboration covers locomotives operated at industrial sites, mines and rail yards, where they are used for shunting and on-site transport. The new rail-use Blade batteries are required under the agreement to satisfy automotive-grade standards. FinDreams Battery will take part in battery R&D and production, while Changsha Fusheng Technology will be responsible for integrating systems and developing applications, drawing on its battery management systems and electronic control technology.

Changsha Fusheng Technology specializes in integrated energy systems for equipment that operates within designated areas. In this partnership, it will concentrate on combining Blade batteries with the control systems required for industrial rail operations. The announcement gave no details on the deal’s value, expected battery supply volumes, locomotive specifications, or when commercial deployment might begin.

The deal follows other recent moves by FinDreams Battery in mining and industrial transportation. Two days earlier, on Sept. 5, it signed a comparable agreement with Zero Carbon Engine Technology Group. The two companies plan to look into projects in Mongolia, including electric mining trucks.

Rail locomotives represent a fresh use case for BYD, but the company is not new to heavy-duty electric vehicles. In June 2026, it handed over 100 T31 electric dump trucks to construction transport firms in Shenzhen; each truck carries a 424 kWh Blade Battery. The Q3 electric tractor truck also relies on Blade Batteries and appeared alongside the T31 at an April event in Hunan, where BYD won agreements for 150 new-energy heavy trucks. BYD plans to launch the Q3 electric tractor at IAA in Germany later this year.

BYD is still China’s No. 2 battery supplier. In the first seven months of 2026, its domestic EV battery installations totaled 72 GWh, giving it an 18% share, a 13% decline from a year earlier. Over the same period, CATL installed 186 GWh in China, capturing 46% of the market, up 22% year on year. Some automakers are trying to lessen their reliance on CATL. Li Auto, for example, is moving toward batteries designed in-house and produced by Sunwoda.

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