Bose® Lithium-Ion battery replacement for Bose® QuietComfort® 3

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  Expensive but convenient 1 1  

  Bose® Bose® Spare Battery Lithium-Ion battery for QuietComfort® 3 (Electronics)

  as my helmet is a working tool, it allows me to change the battery when the other is empty and thus hold the week.
  Buy at Amazon.com