How long does the battery last, not use time, but the life of it ? I seen a video on youtube said it only last three years and you cant replace it. Is this true ?I'm thinking if it is, why should i buy these headphones then.
Thanks for posting and welcome to the Bose Community! The battery life for the QuietComfort 20's lasts around 500 charge cycles at 80% capacity.
The battery is a Rechargeable non-replaceable lithium-ion polyme that is rechargeable! If you do ever run into any issues with the battery of the headphones then our customer support team will be on hand to assist you with this.
If you have any other questions about the QuietComfort 20 In-Ear Headphones please do let us know.
Hector B - Community Support