This Bluetooth speaker has a group of LEDs behind a translucent white bar in its front lower area. This battery indicator bar on the JBL Boombox 2 displays battery status and shows whether it’s draining or charging.
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, no lamps light up. This bar also shows as dark when a charger IS co 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.
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 part of the bar blinks white. Then as charging continues, more of it lights up, and the flashing part 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.
It only flashes red like this when the battery is nearly dead and AC power is not yet present. But when you connect the charger, this red flashing turns to blinking white. Remember though, that this light never flashes red while charging is working correctly.
3. When All Lamps Light Up Solid, Charging is Complete
As charging continues, more of the battery meter lights up solid. That is, the flashing LED moves further up the bar until that blinking reaches the top.
Battery charging is complete 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. You can see that right after you power up the speaker. Or it also appears whenever you press the Volume UP or Volume DOWN buttons. To save power, these lamps go dark after some seconds.
The last picture shows the speaker running. The entire battery meter bar glows here. This means that the battery is between eighty and one hundred percent full.
Reading the JBL Boombox 2 Battery Indicator in the Portable App
You can also see the battery indicator in the JBL Portable app. Just pair the 3 with this device and bring up the app.
Then, once the app detects the speaker, it displays the speaker’s home page as we see next.
The indicator we point out with the dark blue arrow. It shows how full the battery in the speaker is. The more of that bar that is green in color, the fuller the battery.