How about Guangyu Koster Company?

Guangyu Power Supply is a professional lithium-ion battery manufacturer and system integrator, focusing on lithium batteries. It has more than 20 years of experience in producing R&D and lithium-ion batteries, and its R&D level and market share are in a leading position in China. Therefore, his batteries are independently developed, and the battery life of lithium manganese phosphate batteries seems to be much higher than other brands in the industry. I really have no problem using it, and the motivation is quite real. Running fifty or sixty kilometers is a small matter.