Picture of the glowing or flashing red light on the JBL Charge 5 speaker.

JBL Charge 5 Speaker Red Light

This speaker has a red light that blinks when the battery is almost dead. Now we find this lamp in the battery level bar on the front of the unit. But sometimes though, this light stays red or flashes for longer than normal periods.  E.g. It starts blinking during play and does not stop, even when you connect a charger.  This may indicate that the unit is not charging properly. So in this post, we offer reasons that the JBL Charge 5 speaker red light might glow. Then we give some fixes to get the battery charging the right way again.

JBL Charge 4 Red Light: Reasons Why It Comes ON

It’s normal that the battery gauge displays a flashing red light near the bottom of the battery status bar. This happens when the battery goes very low.  But this light should go out when you connect the charger.

Picture of the red light on the JBL Charge 5 speaker.
The red light on the JBL Charge 5 speaker.

Normally though, this gauge bar only glows white.  The amount of this bar that  lights up tells you how full the battery is. It can appear as follows.

Picture of the battery level gauge showing a full charge.
The battery level gauge showing a full charge.

Or, once recharging completes, the entire battery level bar goes dark if the Charge 5 is OFF at that time.

Picture of the dark battery gauge.
The dark battery gauge.

Now the red part might not change to white when you connect the charger. If not, then several things might cause this. And we list these below thus.

1.The Power Outlet May Not Be Live

The Problem

The power adapter for the 5 may not deliver any “juice” at all.  Why?  Because it is not receiving any to begin with. This can happen due to a defective AC or car circuit or tripped circuit breaker. A blown fuse, faulty wiring, or general power failure, might cause this too.

The Fix

Check that your outlet has power 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 sure that that switch is ON.

2. Power Supply is Not Working Well

The Problem

The red light keeps flashing perhaps, because your adapter provides SOME but not ENOUGH current. Its output current can fall over time. So it might not deliver the correct amount presently.  But note that the Charge 5 needs 3 amps at 5 volts (15 watts). Otherwise it will not fully recharge in the 4 hours spec time.

The Fix

The solution is to replace the adapter, preferably with a higher output model. We recommend chargers from Key Power, Belkin, and Anker. These can deliver at least 15 watts of USB-C power.

3. The USB-C Charging Cable is Too Long, Too Thin, or is Defective

The Problem

The USB-C cord can limit the charging current too much, even if your power supply is working well.  This might happen with very long or thin cables.

The Fix

To solve this, use as short a cord as practical. Or, upgrade to a thicker, higher current handling cable. Keep cable lengths to six feet or less, and use one certified to carry at least 3 amps. We further suggest using a USB-C to USB-C cable, instead of a USB-C to USB-A one. These older standard cables limit the charge current to well under 3.0 amps.  Finally you’ll need a charger with a USB-C port for the USB-C cable to fit.

4. The Battery in the Charge 5 is Bad

The Problem

As lithium ion batteries age, they lose their ability to fully recharge. And the characteristics of the current they draw can lessen over time.  Normally, as a battery recharges, it draws less charging current. But when the battery fails, the cells may draw too little charging amperage. This can thus confuse the charging circuits. So they may react as though no charging is occurring.  So, the red lamp stays ON for extra long periods.

The Fix

To fix this, replace the battery. But keep in mind that you can’t easily get to it in the JBL Charge 5 Speaker. Indeed, changing the battery means that you must take apart the 5.

But note that doing this likely breaks the moisture seal.  Thus this seal will not longer protect the Charge 5, should you get water on it.

Furthermore, breaking this seal may also change the sound quality too. So get someone to replace the battery 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 and provide 3.6 volts and at least 7,500 mAh (27 watt-hours). But we suggest using only JBL certified battery assemblies for Charge 5.

5. The Unot Could be Defective when the JBL Charge 5 Speaker Red Light Does Not Turn OFF

The Problem

Now you have enough power supply. Yet the charging current that actually reaches the battery may be too low or high.  This can happen when the battery management circuits inside the Charge 5 fail.  Note that these systems read the battery status. Then they shut off the charging current when the battery becomes 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 go dark 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 when you’re charging it.

The Fix

The best solution here, given the relatively low cost of the 5, is simply to buy a new one.  Why?  Because the circuits in this model are quite small. So unless you can swap out the system board(s) yourself, your best bet is to just buy another speaker.

Other JBL Charge 5 Speaker Posts

    1. The Buttons Guide
    2. How to Charge
    3. Bluetooth Pairing Details
    4. Low Frequency Mode
    5. How to Turn OFF This Speaker

References for JBL Charge 5 Speaker Red Light

    1. Official JBL Charge 5 Speaker Product Page
    2. Where to Buy the JBL Charge 5 Speaker