Sony WH-CH720N Help Manual page 19

Usage hours may be different from the time described above depending on the settings for the headset functions and usage
conditions.
If you set the following functions, the available operating time of the battery becomes shorter than the ones described above.
Equalizer
DSEE
Function to launch the voice assistant by your voice
If you run the above settings at the same time, the available operating time of the battery becomes even shorter.
Related Topic
Supported codecs
About the DSEE function
What you can do with the "Sony | Headphones Connect" app
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