| Use this guide to replace a worn out or dead battery in your Bose Quiet Comfort 35. |
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| If your battery is swollen, [[What to do with a swollen battery|take appropriate precautions|new_window=true]]. For your safety, '''discharge your battery below 25%''' before disassembling your headphones. This reduces the risk of a dangerous thermal event if the battery is accidentally damaged during the repair. |
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| For this guide we recommend the use of a hairdryer or a heat gun. It’s manageable to disassemble your headphones with the use of an iOpener however the disassembly gets way more difficult. |
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| You’ll need replacement adhesive and a soldering iron to loosen components during disassembly and and to reattach them when reassembling the device. |