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X3 Battery and Power Bank

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The latest generation of our power technology, designed to keep you warm all day. With the X3 plugged in, you will never leave home without a source of energy to power your mobile devices. This power bank is the fastest charging battery we have ever developed and optimally designed to be used with all Kelvin 7.4v products including Berwyn, Fullerton, Cermak, Jackson, Howard, and Jarvis jackets. 


Our batteries are engineered, tested and sized to provide you with the optimal trade-off between heating power and weight.

  • 7.4v 5200 mAh Li-ion battery
  • USB output for portable device charging
  • Heating time: High 3 hours | Low 5 hours | Eco 8 hours
    • Battery charge level indicator

    What's Included

    • (1) X3 Battery
    • (1) 8.4v charger