We are a Power Bank&Speaker factory doing OEM & ODM service for about 10 years. Some Europe famous companies are our customers, such as Lenco and TNB.The battery we use is Grade A cell, the brand such as Samsung, China First, ZHONGNENG,Fushen, you can search them via website.Our factory have all cell test equipments, SMT line, laser printing machine, ageing test room. All items carry CE, FCC, RohS, UN38.3, MSDS certificate. Private&Public tooling included.