How to tell if JBL Boombox 2 is charging? Well, this BT speaker, with its GIANT power bank, has a single row of small LED lights on the front. This indicator tells battery level and charging status. To see if this speaker is charging, look at this bar.
Of course, you can be certain that this speaker is NOT charging with no cord connected to it.
There are five LED lamps behind a translucent strip that light, one after the other, as charging advances. You can tell if the JBL Boombox 2 is charging if you see one of these lamps flashing white. When the battery inside is “undeniably dead,” the light at the bottom end of this strip blinks white while charging. Then as the battery fills up, that lamp changes to a steady white glow. Then, the next lamp above it starts flashing white.
Also, the speaker may warm slightly during charging as does its charger adapter. This warmth is a quick way how to tell if the JBL Boombox 2 is charging.
As speaker charging moves on, more of the LEDs light solid. Also the flashing moves further upward, until it reaches the last of these five battery level lamps. This progressive lighting of the LEDs is another indication that the speaker is indeed charging.
This next picture shows the JBL Boombox just before wrapping up a charging cycle. Note that all the lamps in the battery status meter glow. But the last one goes on blinking for several minutes.
The charge cycle is complete when all battery gauge LEDs go dark. Thus, the battery is no longer recharging when all lamps are OFF. Even with the charger cord still present, no lamp glows when battery is full. The Boombox 2 stops charging at this point.
If the battery LEDs read full (all lights lit), this your Boombox 2 did indeed charge.
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