Checking the remaining battery charge
You can check the remaining battery charge of the rechargeable battery.
When the 
button is pressed while the headset power is on, the voice guidance indicating the remaining battery charge can be heard.
“Battery about XX %” (The “XX” value indicates the approximate remaining charge.)
“Battery fully charged”
The remaining battery charge indicated by the voice guidance may differ from the actual remaining charge in some cases. Please use it as a rough estimate.
In addition, the indicator (red) flashes (about 15 seconds) if the remaining battery charge is 20% or lower when the headset is turned on.
When the remaining charge is low
The currently operating indicator display changes to red. If you hear the voice guidance say, “Low battery, please recharge headset”, charge the headset as soon as possible.
When the battery becomes completely empty, the headset sounds a warning beep, the voice guidance says, “Please recharge headset. Power off”, and the headset automatically turns off.
When you are using an iPhone or iPod touch
When the headset is connected to an iPhone or iPod touch over an HFP Bluetooth connection, it will show an icon that indicates the remaining battery charge of the headset on the screen.
A: Remaining battery charge of the headset
B: 100% - 70%
C: 70% - 50%
D: 50% - 20%
E: 20% or lower (needs to charge)
The remaining battery charge of the headset is also displayed on the widget of an iPhone or iPod touch running iOS 9 or later. For more details, refer to the operating instructions supplied with the iPhone or iPod touch.
The remaining charge which is displayed may differ from the actual remaining charge in some cases. Please use it as a rough estimate.
When you are using an Android smartphone (OS 8.1 or later)
When the headset is connected to an Android smartphone over an HFP Bluetooth connection, select [Settings] - [Device connection] - [Bluetooth] to display the remaining battery charge of the headset. It is displayed as “100%”, “70%”, “50%”, or “20%”. For more details, refer to the operating instructions supplied with the smartphone.
The remaining charge which is displayed may differ from the actual remaining charge in some cases. Please use it as a rough estimate.
Hint
- You can also check the remaining battery charge with the “Sony | Headphones Connect” app. Android smartphones and the iPhone/iPod touch both support this app.
Note
- If you connect the headset to an iPhone, iPod touch, or Android smartphone with “Media audio” (A2DP) only in a multipoint connection, the remaining battery charge will not be displayed correctly.
- The remaining battery charge may not be properly displayed immediately after a software update or if the headset has not been used for a long time. In this case, repeatedly charge and discharge the battery multiple times to properly display the remaining battery charge.
