Give yourself up to 10 hours of extra battery life with the 6500mAh Gobi Heat lithium-ion battery.Works with all Gobi Heat® Jackets, Hoodies, and Vests as well as the Terrain Heated Camping Chair and Vantage Heated Stadium Seat. NEW BATTERY UPDATE — We heard you! We have upgraded our 6500 mAh battery to now include a USB-C charging input so that you no longer need a separate charger. Just plug the battery into the USB-C charging cable (provided) and plug the other end into any USB port and you are good to go! This is a very recent upgrade so there’s a chance you thought you were getting the previous version that required you to use our charger.