Most JBL wireless speakers, including the Boombox 2, offer portable operation via a beefy internal battery. And when that battery goes dead, you can recharge the speaker via an AC or car adapter. For recharging, this speaker comes with a 24 volt AC power supply. Sometimes though, you may notice that the JBL Boombox 2 is not charging fully, or at all, even when you connect the adapter to power, and then to the speaker. In this piece, we’re here to help.
How to Tell that the JBL Boombox 2 is Not Charging
Read the Battery Status Gauge
You can tell that the JBL Boombox 2 is likely not charging, among other ways, is by reading the battery status gauge on the front lower portion of the unit, beneath the JBL logo. Note that this meter starts blinking red during play, to let you know that the battery is running quite on power. And the flashing does not stop, even when you plug in the charger. It should change at this point though, to blinking white, which indicates that the speaker is getting some power from the supply. But if it continues red, then recharging is not occurring.
Then too, the battery meter normally shows recharging progress. I.e. as the speaker recharges, more and more of the gauge bar lights up white. But if you don’t see more light after a few hours while recharging, then chances are, the charging process is failing.
Feel the Heat
You can also feel the AC adapter’s side panel ten or twenty minutes into the charge cycle. The speaker itself heats slightly as well during correctly charging operation. But if you feel no warmth, then again, your JBL Boombox 2 is not charging.
Thus when you notice that the Boombox 2 is not charging, even though it should be, you’ll want to find out what’s wrong and how to remedy the situation. So in this post, we offer reasons why the speaker may not recharge. Then we give possible fixes for this typical problem.
JBL Boombox 2 Not Charging, Reasons and Fixes
As we mentioned above, it’s normal that the charge level gauge blinks red when the battery is about dead, as we show next. But this meter should turn to a flashing white when you attach the speaker to the charger, and that power supply to a suitable power outlet.
Normally though, this meter only displays white lights. The number of these lamps glowing tells you how full the battery is. It can appear as follows.
Or, if the Boombox 2 is OFF when charging starts, and you don’t turn it ON during charging, then once recharging wraps up, all lights in this gauge go dark. See this in the next picture.
If the gauge 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 Be Dead
The JBL Boombox 2’s AC or car adapter may not output any power because it is not receiving any to begin with. This can happen due to a defective circuit, tripped breaker, blown fuse, faulty wiring, power failure, and so on.
Check that your receptacle has voltage by plugging in a lamp or other device. Set circuit breakers back to ON if tripped, and if the outlet has a light switch that controls it, then be sure that that switch is also in the ON position.
2. The Adapter is Broken
The JBL Boombox 2 not charging can also occur because the adapter is providing SOME but not FULL charging current to completely recharge the speaker, even though its getting the correct power input. Now as the unit ages, its output energy can shrink over time. So the adapter might not deliver the correct amount presently.
When this happens, you may see the gauge turn to a flashing white, but not gradually advance toward full charge. Or it may advance, but do so more slowly than usual.
Please note that this speaker needs 4.2 amps at 24 volts (100.8 watts) from the adapter to fully recharge in the specified time of roughly 6.5 hours. But charging speed may not go as rapidly as we expect if the charger does not deliver on these requirements.
The solution is to replace the power adapter, preferably one that delivers the stated voltage and current. We advise that you order a replacement directly from JBL for the safest yet quickest recharging.
3. The Battery in the Boombox 2 is Faulty
As lithium ion batteries age, they lose their ability to fully charge, 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 fills. But in the case of cell failure, it may draw too many or too few amps, thus confusing the charging circuits into behaving like no charging is occurring. So the gauge shows that charging is not happening.
To address this, replace the battery. But keep in mind that you can’t easily get the old one out of the speaker. Indeed, changing the battery means that you must take the speaker apart, and this is a delicate endeavor.
Also note that doing this likely breaks the water resistant seal. So the speaker may no longer be safe to use, should you later expose it to water.
Breaking this seal may well change the sound quality too. So get someone to change the old battery who knows how to pick the right replacement. They should also have the skills and supplies to restore the seal to as it was, as they reassemble the speaker.
A good battery should fit well inside and provide 72.6 watt-hours. But we suggest using only JBL certified batteries for this speaker.
4. This JBL Boombox 2 Might be Defective when it Does Not Charge
Even if you have the proper power supply, with a working speaker battery, the charging current that actually gets to the cells may be too low or too high. This can happen when the battery management circuits in the Boombox 2 break down. Note that these systems are responsible for reading the battery status. Plus, they shut down the charging current when they see that the battery is full.
But when they fail, the battery might get no power at all. Thus, it never recharges. Again, in this case, the battery gauge might never stop blinking, even with the charger attached. You may also see that the speaker doesn’t last as long per charge before going dead, if it lasts at all, until you connect the charger. Or it might not play any amount of time from the battery.
The best answer here, is simply to get a new JBL Boombox 2. Why? Because the electronic parts in this model are tiny. So unless you can confidently replace the system board(s) yourself, or know someone who will do it for you, just buy another speaker to save a bunch of aggravation.
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- 2022-08-03: First posted.