JBL Boombox 2 Battery Indicator

The Boombox 2 Bluetooth speaker has a group of LEDs behind a translucent white bar in its front lower area, as we see in the pictures that follow. This displays battery status whether it’s draining or charging. I.e. The Boombox 2 JBL battery indicator shows you charging progress, or how full the battery is at a given time while charging. It also tells you how much “juice” the battery has left as the battery discharges.

How to Read the JBL Boombox 2 Battery Indicator

1. The Battery Indicator is Entirely Dark

When you power down the Boombox 2 with no charger connected, no lamps light up, as we see next. This bar also shows as dark when a charger IS connected but the battery finished charging to full. The battery indicator is just to the left of where the USB-C charging cable plugs into the speaker.

Picture of the dark battery indicator on the JBL Boombox 2 speaker. — The dark battery indicator on the JBL Boombox 2 speaker.

2. JBL Boombox 2 Battery Indicator Shows Battery Recharging Progress

There are five tiny LED lamps inside the speaker, that illuminate the battery indicator bar in various degrees. These light in succession as the speaker charging fills the battery. The Boombox 2 is charging when you see part of the bar blinking white. When the battery is fully depleted, the bottom edge of the bar blinks white while charging. Then as charging continues, more of the bar lights up, and flashing end of the bar moves upward.

Note though, that you may see the bottom most part of the indicator blink red. This does not mean that charging is proceeding. Instead, it means that the speaker battery is critically low and that you should recharge the speaker immediately.

Picture of the blinking red battery indicator. — The blinking red battery indicator.

It only flashes red like this when the battery is nearly dead and AC power has not yet been connected. But when you do that, this red flashing light begins blinking white. Remember though, that this light never flashes red while charging is happening.

3. When All Lamps Light Up Solid, Charging is Finished

As speaker charging continues, more and more of the lamps on the JBL Boombox 2 battery meter light up solid, That is, the flashing LED moves further and further up, until that blinking reaches the topmost area of the bar.

Battery charging is done when all but the very last little segment of the indicator lights solid. That last part continues to blink for several minutes. Again, you know that charging is occurring if one of the battery charge level lamps is flashing white.

Note that during the charge cycle, part of the indicator is dark (top most portion). This lets you know about how much more the battery must charge before reaching fullness.

The battery recharge cycle finishes when the entire battery status gauge goes dark, as we see above. Thus, the battery is no longer charging when all lamps are OFF. Even with the AC charger still connected, no part of the indicator glows when the battery is full.

4. The JBL Boombox 2 Battery Indicator Also a Battery Charge Remaining Meter

When unplugged from the charger, what was the battery charging indicator becomes the battery charge left indicator. The more lights lit, the fuller the battery. The fewer glowing lamps, the less speaker run time left. These lamps show battery status for a brief time after you power up the Boombox 2, or whenever you press any of the buttons. To save power, these lamps go dark after some seconds. So to see the battery charge remaining indication once more, just press the volume UP or DOWN buttons to bring the lamps back to life.

Picture of the battery gauge on the JBL Boombox 2 speaker, showing full charge, all of the bar glows. — The battery gauge on the JBL Boombox 2 speaker, showing full charge, all of the bar glows.

The last picture shows the speaker powered ON, with the entire battery meter bar aglow, meaning that the battery is between eighty and one hundred percent full.