Picture of the red light on the JBL Charge 4 glowing.

JBL Charge 4 Blinking Red Light, How to Fix

Many JBL speakers, including the Charge 4 model, have a blinking red light when the battery is almost out of power. In the case of this speaker, we find this lamp in the battery gauge on the speaker’s base, in the front. Sometimes though, this red light blinks for long periods as you play the speaker.  E.g. It begins pulsating red during play and does not stop, even when you connect a charger.  Thus in this post, we offer reasons that red light blinking happens on the Charge 4.  Then we give possible fixes for this common problem.

 JBL Charge 4 Red Light Blinking, Reasons and Fixes

It’s normal that the battery gauge gives off a blinking red light when the battery is very low.  But this lamp should turn white when you connect the speaker to a charger, and battery recharging begins.

Picture of the red light on the JBL Charge 4 glowing.
JBL Charge 4 red light glowing.

Normally though, this gauge only shows white lights.  The number of lamps that  glow tells you how full the battery is. It can appear as follows.

Picture of the JBL Charge 4 splashproof speaker, front view, powered On, and showing the lighted battery gauge.
The JBL Charge 4 splashproof speaker, front view, powered On, and showing the lighted battery gauge.

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 gauge go out. See this in the next picture.

Picture of the JBL Charge 4 battery meter with all lights dark.
JBL Charge 4 battery meter with all lights dark.

But if the blinking red lamp in this meter does not change to white when you plug the charger into the speaker, then several things might cause this. We list these below thus.

1.The Power Outlet May Not Be Live

The Problem

The AC or car adapter for the JBL Charge 4 may not deliver any power because it is not receiving any to begin with. This can happen due to a defective AC or car circuit, tripped circuit breaker, blown fuse, faulty wiring, power failure, and the like.

The Fix

Check that your outlet has electricity by testing it by plugging in a lamp or other device.  Reset circuit breakers if tripped, and if the outlet has a light switch that controls it, then be certain that that switch is in the ON position.

2. Power Supply is Not Working Well

The Problem

The JBL Charge 4 red light continues blinking perhaps because the AC or car adapter you’re using provides SOME but not ENOUGH charging current, even though its getting the correct power input. Its output energy can fall over time. So it might not deliver the correct amount presently.  Please note that this speaker requires 2.3 amps of charging current at 5 volts (11.5 watts) from the supply to fully recharge in the specified time.

The Fix

The solution is to replace the adapter, preferably one that delivers at least that 5 volts at 2.4 amps (12 watts).

3. The Battery in the Charge 4 is Defective

The Problem

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 older.  Normally, as a battery recharges, it draws less and less current as it charges. But in the case of battery failure, it may draw too much or too little amperage, thus confusing the charging circuits into behaving like no charging is occurring.  So, the red lamp keeps blinking.

The Fix

To fix this, replace the battery. But keep in mind that you can’t easily get to it in the Charge 4. Indeed, changing the battery means that you must teardown the speaker.

But note that doing this likely breaks the water resistant seal.  Thus the speaker will no longer be safe to use, if you get it wet.

Breaking this seal may also change the sound quality too. So get someone to replace the battery who knows how to pick the right replacement. They should also be able to restore the seal to as it was, as they reassemble the speaker. A good battery should fit well inside.

5. The Speaker Might be Defective when the JBL Charge 4 Red Light is Blinking

The Problem

Even if you have the correct power supply, with a working battery, the charging current that actually gets to the battery may be too low or too high.  This can happen when the battery management circuits inside the Charge 4 JBL speaker fail.  Note that these systems read the battery status, and shut off the charging current when they deem the battery full.

But when they fail, the battery might get no power at all.  Thus, it never recharges.  Again, in this case, the red light might never stop blinking, even with the charger attached. You may also see that the speaker doesn’t play as long before going dead. Or it might not play at all, except when you’re charging it.

The Fix

The best solution here, is simply to get a new speaker.  Why?  Because the circuits in this model are quite small.  So unless you can replace the system board(s) yourself, or know someone who will do it for you, just buy another speaker to save a boat load of aggravation.

Other Posts About the JBL Charge 4 BT Speaker

    1. JBL Charge 4 Watts Output, Input, Battery, AC…
    2. JBL Charge 4 Charging Time
    3. How to Reset JBL Charge 4 Speaker
    4. JBL Charge 4 Bluetooth Pairing Directions
    5. Charge 4 JBL Speaker Charger Type and Replacement Help

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References for JBL Charge 4 Blinking Red Light Problem

    1. JBL Charge 4 Official Support Page at JBL.com
    2. Where to Buy the JBL Charge 4 Speaker

Revision History

  • 2022-08-29: First posted.