The remaining battery charge of the headset is not displayed on the screen of an iPhone or iPod touch. The noise canceling function cannot be used while charging or if kept connected to the computer after charging is complete. You can use the headset by connecting the supplied headphone cable, even while charging the headset. The headset cannot be charged when the computer goes into standby (sleep) or hibernation mode. In this case, change the computer settings, and start charging once again. If the headset is not used for a long time, the rechargeable battery usage hours may be reduced. However, the battery life will improve after a few recharges.

Charging the headset - Sony WH-CH710N | Help Guide | Charging the headset - Sony

Lights up in green for about 6 seconds when the lid of the charging case is opened or closed with the headphones are NOT stored Lights up in green for about 6 seconds when the lid of the charging case is opened or closed with the headphones are stored If the headset detects a problem while charging due to the following causes, the indicator (red) flashes. In this case, charge once again within the charging temperature range. If the problem persists, consult your nearest Sony dealer.

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If you store the headset for a long time, charge the battery to its full capacity once every 6 months to avoid over-discharge.

Tips on charging headphones (WF-1000XM4) | Sony UK

If the headset is not used for a long time, the indicator (red) may not light up when you connect the micro- USB cable to charge the headset. Wait for a specified amount of time until the indicator (red) lights up.

If the headset is not used for a long time, the indicator (red) may not immediately light up when charging. Please wait a moment until the indicator lights up. If the usage hours of the built-in rechargeable battery decrease significantly, the battery should be replaced. Consult your nearest Sony dealer.

WH-CH700N | Help Guide | Charging the headset - Sony WH-CH700N | Help Guide | Charging the headset - Sony

Sony Headphones come with an attached Micro-USD wire. It would help if you connected this cable to the charging case. It would help if you joined the other terminal of the chord to your computer.If the headset detects a problem while charging due to the following causes, the indicator (red) flashes. In this case, charge once again within the charging temperature range. If the problem persists, consult with your Sony dealer. If the life of the built-in rechargeable battery drops significantly, the battery should be replaced. Consult your nearest Sony dealer for replacement of the rechargeable battery. If the headset is not used for a long time, the rechargeable battery usage hours may be reduced. However, the battery life will improve after a few recharges. If you store the headset for a long time, charge the battery to its full capacity once every 6 months to avoid over-discharge.

WH-1000XM4 | Help Guide | Charging the headset - Sony

Always automatically optimizing the noise canceling performance to suit the wearer and usage environment (Auto NC Optimizer) When connecting the headset to a computer, use only the supplied USB Type-C cable, and make sure to connect them directly. Charging will not be properly completed when the headset is connected through a USB hub.

If the headset detects a problem while charging due to following causes, the indicator (red) may turn off or flash although charging is not complete. In this case, charge again within the charging temperature range. If the problem persists, consult your nearest Sony dealer. Sony Headphones are in high demand for its unique features, and as it produces the most excellent audio experience. Besides these headsets are highly durable, and you can pair with all types of modern devices. Passages underneath shall guide you about charging these headsets and various other points that are relevant to the context. Your guide about charging Sony Headsets