When in music mode with ANC mode turned off, the earphones play music back for up to 37 hours. When in music mode with ANC/transparency mode turned on, the earphones play music back for up to 23 hours. When in music mode with Transparency Mode on, the earphones play music back for up to 22 hours. When in call mode with ANC turned off, the earphones can be used continuously for up to 20.5 hours. When in call mode with ANC turned on, the earphones can be used continuously for up to 18.5 hours. When in call mode with Transparency Mode on, the earphones can be used continuously for up to 19 hours. Testing conditions: AAC mode, music playback at 50% volume. Charging and battery tests are based on testing conducted by Nothing (at a temperature of 25°C or 77°F). Actual battery life depends on factors such as volume, frequency, output source, environmental interference, product features and usage habits. Actual experience will vary based on individual usage.