The NITECORE NL1829LTP is a high capacity 18650 battery is specifically designed for low temperature environments. Capable of storing 2900mAh of energy and outputting a maximum current of 4A, this battery is compatible with many high performance flashlights and headlamps. Specially designed for freezing temperatures and able to power electronic devices at temperatures down to -40F, the NL1829LTP is ideal for severe cold weather applications like mountain climbing, deep sea diving, arctic exploration and more.