Sony WF-SP900 Help Manual page 24

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We recommend that you charge the charging case.
Hint
You can charge the charging case on its own without storing the player inside. We recommend that you charge the charging case
when you are not storing the player.
Note
Firmly insert the USB Type-C cable all the way in. Charging will not start until you insert the USB Type-C cable completely.
The charging case is not water resistant. Before you store the player inside the charging case, ensure the following.
The player is not wet.
The supplied accessories (earbuds, arc supporters, and leash cord) are not wet.
Leave the player and accessories at room temperature until they are completely dry before you start charging.
Do not use the charging case with wet hands. Do not store the player inside the charging case when the player and the
accessories are wet.
If the lamps ( , ) or the charging lamp (
active. This function protects the player and the charging case from battery deterioration or battery bursting. Leave the player or
the charging case at a normal temperature for 1 or 2 hours. Then, charge the player and the charging case at a temperature
between 5 °C and 35 °C (41 ºF to 95 ºF).
The computer may not recognize the player in the connected charging case in the following situations.
When you connect the player to the computer via the charging case for the first time.
When you have not used the player for a long period of time.
Charge the player for about 10 minutes. The player may start operating normally.
When the charging case is not working correctly.
Press the RESTART button on the charging case with a pen or a paper clip to restart the charging case.
The charging case may slip out of your hands when you open the case cover. To prevent slipping, open the case cover in the
following manner.
Hold the bottom of the charging case firmly with one hand around both sides.
Open the case cover with the other hand.
If the terminals of the player are dirty, clean the terminals with a soft, dry cloth.
You cannot operate the player in the following situations.
While the player is connected to a computer via the charging case.
While the batteries are charging.
Depending on the USB AC adaptor, you may not be able to charge the player and the charging case.
Always use the supplied USB Type-C cable.
Instructional video
The following movie shows you how to charge the batteries.
http://rd1.sony.net/help/mdr/mov0001/en/
The contents of the Help Guide may be subject to change without notice due to updates to the product's specifications.
Related Topic
Reducing the battery consumption
Notes on charging the battery
) flashes twice repeatedly during charging, the temperature protection function is
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