Make sure you always have a source of power when your ActionHeat gear starts to deplete in power with the ActionHeat 5 Volt 6000mah Replacement Power Bank. The lithium-polymer core delivers durability, and the weather-resistant design withstands all of the elements to keep you safe. The four LED indicators let you know when the bank is done charging or low in power for your convenience, and the USB output lets you also charge your phone, tablet or other devices when they start to die.