The KLARUS 18GT-LT29UR rechargeable battery, with a capacity of 2900 mAh, is specifically designed for use in frigid conditions. The advanced Li-ion chemistry ensures stability and reliability, even in temperatures as low as -40 degrees Fahrenheit. This makes it a top choice for powering outdoor electronics during the winter season, such as for ice fishing. Whether facing sub-zero air temperatures or relying on a flashlight during moonrise or moonset, this cold-resistant 18650 battery is a valuable asset to have in your arsenal.