Many JBL speakers, including the Flip 6, have a light that glows or blinks red when the battery is almost out of power. In the case of the Flip 6 here, we see this lamp in the battery gauge on the front button panel. But sometimes, this light stays on or flashes for long periods as you play the speaker. E.g. It starts pulsing during play and does not stop, even when you connect a charger. Thus in this post, we list reasons why this can occur, and give possible fixes for this typical problem.
Why JBL Flip 6 Red Light Stays On
It’s normal that the battery gauge gives off a blinking red light when the battery is very low. But this red light should turn white when you connect the Flip 6 to a charger, and battery recharging begins.
But normally, this gauge is dark or only glows white, and the amount of the gauge bar that glows tells you how full the battery is. It can appear as follows. In this example, the meter shows a full charge in the speaker battery.
Or, if the speaker is OFF when charging starts, and you don’t turn it ON during charging, then once recharging finishes, all lights in this meter go out. They also go dark when the speaker is running, without the charger connected, and the battery is not critically low. See this in the next picture.
But if the red light is flashing, and remains red when you connect the power adapter to the speaker, then several things might cause this. We give these below thus.
1.The Power Outlet May Not Be Live
The AC or car adapter for the JBL Flip 6 may not deliver any power because it is not receiving any to start with. This can happen due to a faulty AC or car circuit, tripped circuit breaker, blown fuse, loose wiring, power failure, and the like.
Check that your outlet has power by plugging in a lamp or other device. Reset circuit breakers if open. And, if the outlet has a light switch that controls it, then be sure that that switch is ON.
2. Your Power Adapter is Not Working Properly
The JBL Flip 6 red light stays on or continues blinking perhaps due to the AC or car adapter you’re using giving SOME but not ENOUGH charging current, even though its getting the correct power input. Plus, for older adapters, the output energy can fall over time. So your adapter might not deliver the correct amount presently. Please note that this speaker requires 3 amps of charging current at 5 volts (15 watts) from the power supply to fully recharge in the specified time of 2.5 hours.
The solution is to replace the adapter with a suitable output newer model. We suggest chargers from Key Power, Belkin, and Anker, that deliver the 5 volts at 3 amps USB-C power levels for this speaker.
3. The USB-C Charging Cable is Too Long, Too Thin, or is Broken
The USB cable can limit the charging current excessively, even if your power supply is working as it should. Indeed, this might happen when using very long or thin cables.
To solve this, use as short a cord as manageable. Or, upgrade to a thicker, higher current handling wire. We suggest keeping cable lengths to six feet or less, and to choose a USB-C cable that is certified to carry at least 3 amps.
4. The Battery in the Flip 6 is Bad
As lithium ion batteries age, they lose their ability to fully recharge, and the characteristics of the charging current they draw changes as they get on in years. Normally, as a battery recharges, it draws less and less amperage. But in the case of battery failure, it may draw too much or too little current at a given time during the charge cycle. Thus, this can confuse the charging circuits into behaving like no recharging is happening. So, lamp stays red.
To stop this, replace the battery. But keep in mind that you can’t easily get to it in the JBL Flip 6. Indeed, swapping out the battery means that you must take the speaker apart.
But note that doing this likely breaks the water resistant seal. Thus the Flip 6 will no longer be protected if you get it wet.
Furthermore, breaking this seal may change the sound quality too, and not for the better. So get someone to change the battery who knows how to pick the right replacement. They should also be able to restore the seal to as it was prior, as they reassemble the speaker. A good battery should fit well inside and provide 3.6 volts and at least 4,800 mAh (17.28 watt-hours). But we suggest using only JBL brand battery units in this speaker.
5. The Speaker Might be Defective when the JBL Flip 6 Red Light Stays On
Even if you have a big enough power supply, and cable with a working battery, the charging current that actually gets to the speaker may be too low or too high. This can happen when the battery management circuits fail. Note that these systems read the battery status, and shut off the charging current when they sense that the battery reaches full charge.
But when these systems break, the battery might get no power at all. Thus, it never recharges. Again, in this case, the red light might never turn white, even with the charger connected. You may also see that the speaker doesn’t play as long before going dead. Or it might not play at all, except during charging.
The best solution here, given the relatively low cost of the JBL Flip 6, is simply to get a new speaker. Also, the circuit boards in this model are quite small. So unless you can replace these board(s) yourself, or know someone who will do it for you, just purchase another speaker.
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References for JBL Flip 6 Red Light Stays On
- 2022-07-25: First posted.