X2 Power Bank

Size Guide

The source of all your heated pleasure. Not only does this battery keep you warm for hours, but you will never leave home again without a way to charge your mobile devices. This power bank is recommended by our experts 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) 7v black power bank
    • (1) 8.4v charger

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