The EP-JB3000 LiFePO4 Jump Starter will operate in the harshest conditions without damage! This lithium jump starter is safe to operate in -13F to 167 F degrees. Perfect for use in all sized cars and trucks plus marine applications. This LiFePO4 Jump Starter can also be used as a portable power supply for your USB devices (iPhone, Android Phone, mp3 player). The 3000 mah LiFePO4 cells are some of the most powerful and safest on the market today.