The JBL Flip 6 Speaker Light Flashing, which is often seen in its front area on the buttons panel. This is normal, and it displays battery status as it charges. Whether it’s draining or charging. So it displays charging progress. Or it shows how full the battery is at a given time. It also tells you how much “juice” the battery has left as the battery discharges.
JBL Flip 6 Speaker Light Flashing: The Power Light
This lamp flashes during firmware updates.

Otherwise, it glows steadily.
The Pairing Lamp
This lamp rapidly flashes when this Flip is in pairing mode.

It glows steadily when this Flip is actually paired to a source device.
Otherwise, it is dark.

Otherwise, it is dark.
JBL Flip 6 Speaker Light Flashing: The Battery Gauge
1. The Gauge Light is Entirely Dark
When you power down the JBL Flip 6 Speaker with no charger connected, no lamps light up. This bar is also dark when a charger IS working but the battery is already full.

2. JBL Flip 6 Speaker Light Flashing: Shows Battery Recharging Progress
There are five tiny LED lamps inside the unit, that light the charging bar in various degrees. These light in succession as the charging fills the battery. The 6 is charging when you see part of the bar flashing white. When the battery is nearly dead, the bottom edge of the bar blinks white. Then as charging continues, more of the bar lights up, and the flashing end of the bar moves upward.
Note though, that you may see the bottom most part of the light blinks red. This does not mean that charging is proceeding. Instead, it means that the battery is critically low and that you should recharge right away.

It only flashes red like this when the battery is nearly dead and AC power is not present. But when you do that, this red flashing light changes to flashing white. Remember though, that this light never flashes red while charging.
3. When All Lamps Light Up Solid, Charging is Complete
As charging continues, more of the LEDs on the flashing white light glow solid. That is, the flashing LED moves further up, until reaching the topmost area of the bar.
Battery charging is complete when all but the very last little segment of the bar 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 light bar is dark. 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 meter glows when the battery is full.
4. This Lamp is Also a Battery Charge Remaining Meter
When unplugged from the charger, what was the battery charging indicator becomes the battery charge left light. The more lights lit, the fuller the battery. The fewer glowing lamps, the less run time left. These lamps show battery status briefly just after you power up the Flip 6. They also show this whenever you tap the volume buttons. To save power, these lamps go dark after some seconds. So to see the charge remaining indication again, just punch the volume UP or DOWN button.

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