Shenzhen Yirui Technology Co., Ltd is subsidiary company of E&J Technology Group which is one of the oldest battery manufacturer in China. Whose battery technology is with same origin of BYD and producing wide range rechargeable batteries cover Ni-Cd, Ni-MH, Li-ion, Li-Polymer, LiFePO4, LTO batteries, battery BMS/Monitors with plants located in Shenzhen and mainland China. Contact us if you want to buy any quantity of any type of battery and BMS. We are the most professional battery manufacturer, supplying worldwide customers with good price and good quality products.