This battery is for the Heated Core Vest and the Heated Core Pant. It is not compatible with the Heated Core Hand Warmer. Features: Re-chargeable 7.4V Lithium-ion battery Approximately 6.5 hours of battery performance at Low setting, 3 hours on the medium setting, and 2 hours on High setting - individual performance may vary depending on heat level selection and usage USB output can be used to charge your mobile device Battery & Charger included This battery is for the Heated Core Vest and the Heated Core Pant. Item weight: 3.04 oz Pnuma Outdoors Iconx Heated Core Powerpack Replacement Charger & Battery for Base Layer