This company is pretty good.
Kunyu New Energy Technology Co., Ltd. is an enterprise mainly engaged in research and experimental development. They are the nation's leading lithium-ion battery manufacturers and innovators. Their characteristics lie in their products. The quality is good. The advantages of the company's lithium batteries are: high energy density, which can reach 500 Wh/kg, and long service life, which can reach on average more than 6 years.