Going on an extra long trek? Don't run out of juice midway! Bring along extra ExtremeMist PCS battery packs to ensure lasting cool comfort! The battery pack lasts at least 12 hours on the lower speeds and at least 3 hours on the highest speed. . Gen 2 battery can be fast charged with included wall charger or charged via USB cord. Battery doubles as a Power Bank to charge your phone or gadgets. Important: When ordering a spare battery, Make sure you order the right "Generation" Battery. A Gen 1 battery will damage a Gen 2 PCS Pump. A Gen 2 battery won't power a Gen 1 PCS Pump. (Gen 2 battery has a button with 4 lights on the top as well as a USB port on each side. Gen 1 only has a micro USB port on the left side.) This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions. (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Features: PCS battery packs to ensure lasting cool comfort! The battery pack lasts at least 12 hours on the lower speeds and at least 3 hours on the highest speed Gen 2 battery can be fast charged with included wall charger or charged via USB cord Battery doubles as a Power Bank to charge your phone or gadgets