Introduction
The Bose QuietComfort 15 headphones use a single AAA battery to power their active noise cancellation feature. If your headphones are not turning on or the noise cancellation is not working properly, the battery may need to be replaced.
Before beginning, make sure you have a new AAA alkaline battery available. Handle the headphones carefully to avoid damaging the earcups or battery compartment.
What you need
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Hold the headphones with the earcups facing you.
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Locate the battery compartment on the inside of the right earcup.
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To reassemble your device, follow these instructions in reverse order.