The 7.4V Lithium Polymer Battery is great to have as a backup on those colder days spent outside. For use in all FIRed up Heated Gloves and Socks. Sold as two batteries with a charger. Features: CE and ULC Certified Slim form factor Two 7.4V 1500 mAh Lithium Polymer No memory so can be topped up at any time 500 Charge capacity Charges from empty in 2 Hours with provided dual charger Comes with a dual voltage charger Lasts up to 1-2 Hours in High setting, 2-3 Hours in Medium Setting and 3-4 Hours in Low Setting Fired Up X 7.4V Lithium Polymer Gloves Batteries with Charger