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 red indicator flashes (about 15 seconds) if the remaining battery charge is low 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 (iOS) that supports HFP (Hands-free Profile), it will show an icon that indicates the remaining battery charge of the headset on the screen.
Usable devices
iPhone or iPod touch which supports HFP (Hands-free Profile)(iOS 5.0 or later)
iOS 10.2 or later
iOS 7.0 or later
iOS 5.X / 6.X
A: Remaining battery charge of the headset
The approximate remaining charge is shown at 10 different levels. B through E are display examples.
B: 100%
C: 70%
D: 50%
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.
Furthermore, 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 or iPod touch 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.
