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Replacing the battery in your product | QuietComfort® 2 Acoustic Noise Cancelling™ headphones (2005)
To replace the battery:
Tip: If the headphones will be stored for extended periods of time without use, removing the battery.

- Tilt the right earcup inward to access to the battery compartment
- Open the battery door by gently pressing and lifting the tab toward the top of the earcup
- Tip the headphones so the battery drops out
- Insert the new battery (positive/+ side first)
- Close the battery door by gently pressing it into the earcup until it clicks.