Since 2004，tchengkj developed superior Lithium Button Cell by using first-rank materials.While the safety standard of heavy metal for lead is 40ppm，mercury is 5 ppm and cadmium is 20ppm，the relevant contents in tchengkj 's Lithium Button Cell are much lower than the standard. This is a further milestone in the development of high performance，reliable and environment friendly batteries.tchengkj has been keen on development of environment friendly batteries for over 30 years.And the fruitful achievement is devoted to our lovely earth，and our next generation.