Front view of the Ultimate Ears Wonderboom 2 speaker.

Wonderboom 2 Battery Indicator, Charging Indicator

The Wonderboom 2 Bluetooth speaker has a single LED on its top panel, close to the front, as shown in the next pictures.  This lets you know battery status, whether it’s draining or charging, or whether it’s low or not when discharging.  However, it does not tell you the charging progress, or how full the battery is at a given time while charging. Nor does it show how much energy the battery has left when discharging, although it does change color when the battery reaches almost-dead state. In this post, we describe how to read the Wonderboom 2 battery status and charging indicator light.





How to Read the Wonderboom 2 Battery Indicator Light

1. The Lamp is OFF 

When you power down the Wonderboom 2 with no charger connected, this lamp, that also doubles as a pilot light, is dark, as shown next.  The lamp is also OFF when the charger IS connected and the battery has finished charging to full.

Top view of the Wonderboom 2 Bluetooth speaker. showing the dark Power button, highlighted.
Top view of the Wonderboom 2 Bluetooth speaker. showing the dark Power button, highlighted.

2. Wonderboom 2 Battery Indicator Shows Charging Progress But Does Not Tell How Much Progress

The status light flashes in a gradually dimming and brightening pattern white as the speaker charges, as shown in the next picture.   On this speaker, this LED is the only visual indication that charging is happening.  But it does not tell how far along the charging is.

Top view of the Wonderboom 2 speaker, charging, with its -Power-button lit and highlighted.
Top view of the Wonderboom 2 speaker, charging, with its -Power-button lit and highlighted.

This slowly fading and brightening white pattern displays while charging, whether the speaker is switched OFF or ON.

Back view of the speaker, showing the charging cord connected.
Back view of the speaker, showing the charging cord connected.

3. When the Battery Indicator Light Goes Out, Then Charging is Done

As speaker charging continues, the light keeps slowly blinking white, battery recharging is done when the lamp goes out, or turns solid white.  It turns OFF when the speaker is OFF, and switches to a solid white glow when the speaker is ON.

The battery recharge cycle finishes when the speaker status lamp turns OFF. Even with the AC charger still attached, the lamp does not glow when battery is full, unless the speaker itself is turned ON.





4. The Wonderboom 2 Battery Indicator Does Not Tell How Much Charge is Left Until It’s Really Low

When unplugged from the charger, what was the battery indicator becomes the battery charge left indicator.  Well kind of.  If it glows solid white, then the battery has some amount of play time left. And, though you cannot tell how much from the light itself, you can press the Volume UP and Volume DOWN buttons at the same time when the speaker is ON, to hear battery status.

But when the battery reaches a near critically low level, the lamp turns from solid white to solid red. We point out the red lamp with the green arrow in the next picture.

Front top view of the Wonderboom 2 speaker, showing the red light highlighted.
Front top view of the Wonderboom 2 speaker, showing the red light highlighted.

Note that once this light becomes red, and should you turn off the speaker, it will not power up again until you charge it up at least a little. If you try to power it on when the battery is nearly dead, the lamp blinks red rapidly for a couple seconds, and then the speaker shuts down.  This behavior also lets you know that the battery must be charged before you again can play the Wonderboom 2.

Related Posts to Wonderboom 2 Battery Indicator

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  2. Wonderboom Battery Indicator, Charging Light
  3. JBL Go 2 Battery Indicator, Charging Indicator Light
  4. How to Check Battery on Ultimate Ears Wonderboom 2
  5. Checking Wonderboom Battery Life and Level

Other Posts About the Wonderboom 2  Bluetooth Speaker

  1. Wonderboom 2 Charge Time, How Long for Full Charging

References for Wonderboom 2 Battery Indicator

  1. Wonderboom 2 Bluetooth Speaker Official Product Page at UltimateEars.com

Revision History

  • 2020-08-14: First published.
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