Picture of the CHARGE indicator lamp glowing orange on the Sony SRS XB40 speaker.

How to Tell if Sony XB40 is Charging

How to tell if Sony XB40 wireless BT speaker is charging?  This desktop speaker has an orange LED light just above the Power-Pairing button, as we see in the next photo.  This light, labeled as the CHARGE lamp, flashes orange when the battery is about dead. So it does tell battery level (to a degree).  When the speaker is not on the charge and this lamp pulses ON and OFF in slow flashes it’s telling you to CHARGE the speaker. This means that the speaker will soon shut down.  But also, to see if the XB40 is in fact charging, check out this LED for this as well.  We explain how to interpret it next.

How to Tell if Sony XB40 is Charging: Summary

    1. Connected and working power cable.
    2. The CHARGE lamp glows steadily.
    3. The speaker and charger typically heat slightly.
    4. Battery percentage increases gradually.
    5. The CHARGE light eventually goes out.
    6. The XB40 reports that battery is fully charged after charging. After charging evidence that charging was indeed occurring.

How to Tell if Sony XB40 is Charging: Step by Step

Connect the Unit to USB Power

Of course, you can rest assured that the speaker is NOT charging with no power cable feeding the speaker.

Check That the  CHARGE LED is Glowing Solid Orange

When the speaker is OFF, you can tell if the Sony XB40 is charging if this light glows a constant orange.  This steady glow happens while charging, when the speaker is OFF only. The lamp does not glow steadily any time the speaker is ON.  But when no charger is powering the unit, this light blinks when the battery has about run all the way out of power.

If the XB 40 CHARGE lamp flashes when the power cord is connected, then the speaker is likely NOT charging.  So you should check that your USB cable, adapter charger, and power source are in working order.  Try a new power supply or a known good cable.  You want this light glowing without blinking to know for sure that the XB40 is charging.

Picture of the CHARGE indicator lamp glowing orange on the Sony XB40.
The CHARGE indicator lamp glowing orange on the Sony XB40.

Check XB40 Temperature

The button panel on the XB40, or the area in and around the rear port compartment may warm a little as well as charging. Plus, most adapters for car and home with will also heat as well.  This warmth is a good sign that speaker charging is happening, so long as there’s neither too much heating, nor none at all.

As speaker recharging advances, the CHARGE LED persists with its glowing.  But unlike some of the more expensive wireless speakers, the XB40 gives no visual reading of just how far along the charging is, just that it is still in progress.

Ask the XB40 to Tell you Battery Full Percentage While it Charges

But you can hear how charging is progressing by pressing and holding in the PHONE-BATT button, also found on the top button panel. Pressing this pushbutton gets the 40 to speak the current percentage of charge in the battery, in a female voice. But the speaker must be powered up for this to work.

Picture of the Phone-BATT button on the Sony XB40.
The Phone-BATT button on the Sony XB40.

When the CHARGE LED Darkens, Charging is Over

The battery charge cycle is finished when the CHARGE LED goes dark.

Picture of the dark CHARGE indicator light on the Sony XB40.
The dark CHARGE indicator lamp on the Sony XB40.

Even with the charger cord still powering the unit, the CHARGE lamp stops glowing when the battery hits the full mark. We see this in the last picture above.  The speaker indeed no longer recharges when the light goes out.

Finally, Unplug the Sony XB40 and Power it ON

With the power cable disconnected, we cannot know just by reading the CHARGE or Status LEDs, just how much the SRS XB40 actually recharged, only that it did charge some. It typically does charge to full though, as long as we wait until the CHARGE lamp goes out before unplugging the adapter. Note that if this lamp does not flash when you next boot the speaker, then the battery likely did charge.

Again though, we can press the PHONE-BATT button when the speaker is running, and if charging completed properly, it will say, “Fully charged,” to us in the lady’s voice.

Other Sony XB40 Posts

    1. Sony XB40 Charge Time
    2. Sony XB40 Specs
    3. Sony XB40 Power Button Not Working
    4. Sony XB40 Pairing
    5. Sony XB40 Charging

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    1. Official Sony XB40 Support Page
    2. Where to Buy the Sony XB40

Revision History

    • 2023-03-26: First published.