According to the customer requests,our R&D engineers successfully developed 3.7V 20mAh ultra thin lithium ion polyermer battery (FLP-042255) after 3 months hard works.This ultra thin cell's thickness is only 0.45mm and weight is only 0.5g.We have been started for mass production on the middle of March,2015.This type battery is mainly appplication for smart IC card,smart bank card and others electronic products which has the extreme thickness for the cells.