Front view of the Sony SRS XB21 speaker with its lights glowing.

How to Check Sony SRS XB21 Battery Life

Covers how to check battery life and level on the Sony Extra Bass SRS XB21 portable Bluetooth speaker, and also, how to tell if the battery life is fading over time.





How to Check Battery Life on the Sony SRS XB21 BT Speaker, Current Charge

1. First, Turn ON the XB21

You won’t be able to read battery charge status unless the speaker is ON.

The -Power- button on the Sony SRS XB21 speaker.
Sony SRS XB21 -Power- button.

To turn on the unit, press and release the Power button, pointed at by the aqua arrow in the last picture. It’s on the speaker top, and the right most button in the button panel as you face the front of this portable Bluetooth speaker.

The Power lamp, also on the top of the speaker, should then light up. E.g. See this in the next picture. Then the speaker may make a two-beep sound if it connects to a close-by device.  If it does not turn on, then the battery could be completely dead.

The glowing -Power- light.
The -Power- lamp glowing.

But as long as there’s some energy in the battery, the speaker should power up.  When it does, move on to the next step.

2. Look at the CHARGE Lamp on the XB21

You can tell at a quick look if the battery is tottering on the edge of going dead by way of the CHARGE lamp. When the battery is not extremely low, this lamp is dark. But when the speaker has just a tiny charge left, the CHARGE lamp flashes orange.

E,g, The next picture shows the CHARGE lamp location.  It’s in the port compartment in the rear of the speaker, near the right side, very close to the USB input port.

Picture of the -CHARGE- light glowing.
The -CHARGE- lamp glowing.

How to Check Battery Life on the Sony SRS XB21, Overall Battery Capacity

When the speaker is new, and using a micro USB charger, the battery charge time is about four and a half (4.5) hours to reach a full charge. And, the full battery should last for around twelve (12) hours of play time before dying, when played at low to medium volume levels and with surrounding temperatures in the 70s or 80s.  At maximum volume, you might only get a few hours of play time.

But a sign of a faulty battery, is that it runs out of power too fast, or takes too little or too much time to fully charge. So if you fully recharge your speaker, but it repeatedly plays for under twelve hours at low volumes before shutting down, its battery may be bad, and unable to hold a full charge anymore.  This is typical of aging lithium ion batteries of the type found in this unit.

Picture of the dark -CHARGE- light.
The dark -CHARGE- lamp.

Or if the CHARGE light goes out in under two hours after you start replenishing the speaker from dead state, then the battery may also be failing.

Also, if the SRS XB21 battery takes longer than six hours to finish filling up, this could also mean a battery nearing its end of useful life.  It might mean too, that the charger you have is not grizzly enough to recharge the speaker in the 4.5 hours that speakers like this one typically require.  So to write off this possibility, try another charger.

Finally, slow charging can happen because your USB charging cable is too thin.  So for best results, we suggest using a thick micro USB cable (one that easily carries 2 amps).





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  1. How to Check Sony SRS XB22 Battery Life
  2. How to Check Sony SRS XB41 Battery Life
  3. Checking the Sony SRS XB33 Battery
  4. How to Check Sony SRS XB13 Battery Life
  5. Checking the Battery Life on the Sony SRS XB12 Speaker

References for How to Check Sony SRS XB21 Battery Life

  1. Sony SRS XB21 Speakers Product Page at Sony.com

Change History

  • 2020-09-22: First published.