ヘッドホンの充電 | Bose QuietComfort Ultra Headphones (2nd Gen)

1. With the headphones off your head, connect the small end of the USB cable to the USB-C port on the left earcup. NOTE: The headphones won’t charge when they are on your head and connected to an external power source.
2. Connect the other end to a USB power source such as a computer or wall charger. The headphones begin charging, and the status light glows solid amber. When the headphones are fully charged, the status light glows solid white.

Charging time

• Allow up to 3 hours to fully charge the headphones. 
• Depending on the following settings, a full charge powers the headphones for up to:
  

  Noise Cancellation	Immersive Audio	Playback Time
  Off	Off	45 Hours
  On	Off	30 Hours
  On	On	23 Hours

• When the headphone battery level is low, a 15-minute charge powers the headphones for up to 3 hours (up to 2 hours with Immersive Audio enabled).

Hear the battery level

Each time you power on the headphones, a voice prompt announces the battery level. When the headphone battery is low, you hear “Battery low.”
NOTE: To visually check the battery, see the status light located on the left earcup.
TIP: You can also hear the battery level using a shortcut. The battery level must be set as a shortcut using the Bose app.

リチウムバッテリーには、満充電に達すると過充電を防ぐために自動オフ機能が備わっています。接続したままでも、バッテリー残量が一定値を下回ると再び充電が開始されます。