Stay warm longer with an extra battery for the Heated Core Hand Warmer IconX Heated Core Vest IconX Heated Core Long Sleeve Shirt and the IconX Heated Core PantRe-chargeable 7.4V Lithium-ion batteryApproximately 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 usageUSB output can be used to charge your mobile deviceBattery & Charger includedNote: Pnuma does not guarantee 3rd party Battery and/or Charger for life. Battery and/or Charger guaranteed against defects in performance for 1 year from date of purchase. Battery life will vary by heat level selection and usage. Pnuma Outdoors, Heated Core Powerpack Replacement Charger & Battery POWERPACK in Black