Our company is located in Shenzhen city,China,specialized in Customizable wide-ranged temperature battery pack,it can work in -40 C to 80 C,it is our the strongest advantage than others.So,it is very popular in North EU countries.We also manufacture some related battery products,for instance,solar battery power supply,outdoor rainproof battery pack,power tools battery,battery battery charger and battery converter,etc.We have 8 years of OEM and ODM experience for overseas markets. Our company has a constant temperature and humidity test chamber, salt spray testing machine, multi-channel temperature tester, full computer power supply integrated test system, full computer safety testing equipment, etc. A batch of advanced product testing equipment and product testing instruments , to ensure that all processes of products from development and design to mass production are under strict quality control.