If the usage hours of the built-in rechargeable battery decrease significantly, the battery should be replaced. Consult your nearest Sony dealer to replace the rechargeable battery. If you store the headset for a long time, charge the battery to its full capacity once every 6 months to avoid over-discharge. Charging may not be successful or require more charging time depending on the type of USB AC adapter.

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

If the usage hours of the built-in rechargeable battery decreases significantly, the battery should be replaced. Consult with your nearest Sony dealer to replace the rechargeable battery. The headset cannot be turned on, nor can the BLUETOOTH and noise canceling functions be used, during charging.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. 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.

WH-1000XM3 | Help Guide | Charging the headset - Sony

If the rechargeable battery has not been used for a long time, its duration may shorten. However, the battery life will improve after a few recharges. Lights up in orange for about 6 seconds when the lid of the charging case is opened or closed with the headphones are NOT storedIf the headset detects a problem while charging due to the following causes, the charging indicator (orange) flashes. In this case, charge once again within the charging temperature range. If the problem persists, consult your nearest Sony dealer.

Accessories | Headphones | Sony UK

There are certain instances, wherein you will find your Sony Headphone turning on, and producing sound. It is likely to happen in either of the following cases:Use the supplied micro-USB cable only, and connect directly to a computer. Charging will not be completed properly by an indirect connection, such as via a USB hub. If you find your Headphone to produce distorted sound, you may reboot the device to overcome the problem. Ensure that you are connecting the Headphone to the source device in the right manner. If the headset detects a problem while charging due to following causes, the indicator (red) may turn off, although charging is not complete. In this case, charge again within the charging temperature range. If the problem persists, consult your nearest Sony dealer. 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-1000XM5 | Help Guide | Charging the headset - Sony

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 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. 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 If you store the headset for a long time, charge the battery to its full capacity once every 6 months to avoid over discharge.If the headset is not used for a long time, the charging indicator (orange) may not immediately light up when the headset starts charging. Please wait a moment until the indicator lights up.