ororo Rechargeable Battery/Power Bank 7.4v 5200mAh for Heated Jackets, Heated Hoodies and Heated Vests ORORO Battery 2019: Featuring an upgraded design with rounded corners that makes the battery more comfortable in your pocket. Take advantage of a faster preheating time by using the only battery specifically designed for all ORORO heated apparel. Longer Battery Life and USB Type-C Charging: Enjoy up to 10 hours of long-lasting warmth thanks to the increased capacity of the 5200 mAh battery, while the USB port allows you to charge your phone or other devices. Quickly see how much battery time is remaining by pressing the button located on the left side of the battery. Universal Travel Adapter: Travel anywhere thanks to this compact design with a foldable US plug and interchangeable EU & UK plugs. 100V-240V worldwide voltage. (100V-240V/ac). Extended Heating Time: Stay warm and enjoy more time outdoors by taking this along as an additional battery pack. Certified Safe: CE certified. Rechargeable up to 800 times. 12-month warranty included. We won't leave you alone in the cold. A: A fully charged battery will last approximately 8-10 hours on low, 5-6 hours on medium, or 2-3 hours on high heating. A: To keep it at peak performance, you should fully charge your battery  before you use it or store it and then once every 3 months after you  store it for the season. A: Yes. There is a USB port on the battery for charging your phone and other electronic devices.