⟐ Commented March 14, 2026 at 23:31 MST

Has anyone tried to replace the 18650 cells and had success?

For me it did not work, and I made no errors in replacing them. My box behaves as if no battery is connected (sometimes noisy sound telling me "critical battery" and such only while plugged into USB). I now wonder if the battery is actually the cause, though it seems so.

⟐ Commented October 01, 2025 at 4:37 MST

It is a “demo” model and hence has bluetooth disabled.

I have tried factory reset (Minus, and power button for 15 secs)

I have tried hard reset (Minus,Plus, pairing button for 15 secs)

When I try to update software with the UE speaker update assistant on windows, Windows cannot detect my device - “USB device not recognized”, and then the update assistant cannot proceed.

⟐ Commented September 19, 2025 at 8:47 MST

Other people have been successful with earlier versions of the speaker in downgrading the firmware to the proper user firmware, but the apps I have are not working for this so far. I have the current version of the update assistant from the UE website which tells me the Megaboom is up to date (and has no option to thus do anything else), and an older app UE_1.3.91_x86 which does not recognise the speaker when the USB cable is connected.

Is there another version of the update app that will work with the megaboom 3 specifically and allow me to downgrade it please?

I’d be incredibly grateful as I was hoping to give this as a present. Thanks

⟐ Commented August 28, 2025 at 18:25 MST

1. pressing all combinations of the buttons (i.e. bluetooth, power, + and - in pairs, triples or all 4), (power&- for 10s resets after sound but still cant turn on without charger)

2. Trying a new battery. (When there was no battery connected in the speaker and it was also connected by a charger, the LED light was flashing but when the battery was connected it stopped working once again) This is the battery replacement i used:

https://www.ebay.com.au/itm/3400mAh-25-1...

3. Repeatedly plug and unplug charger for short cycles ~5s(charger connected)/~2s (charged disconnected) for 5-10mins and then leaving to charge for many minutes.

I have access to 2 chargers on which is quick charger QC 3.0 with 5V & 3A and laptop charger with 5.1V * 1A. I had brief progress today when i did step 3. with the QC 3.0 charger and then connecting the megaboom to the laptop charger after all those cycles. It then momentarily lit up the white charger light for 2-5s but then turned off.

Im running firmware version 2.2.9.

Any help will be appreciated.

P.S: I can’t avail my warranty as it’s past it. I already contacted Logitech recently and they said since i replaced the battery they wouldn’t give me any support.

⟐ Commented January 04, 2025 at 16:07 MST

Now I'm charging it with the LED blinking, however it always says it's charged at 40%. No idea what to do

⟐ Commented May 14, 2024 at 6:14 MST

Battery monitor indicates 40% , even with the battery removed.

The charging led only flashes with the battery removed.

Is this an indication of a faulty PCB?

Does anyone know the pin connections for the battery connector?

⟐ Commented February 27, 2024 at 7:54 MST

⟐ Answered September 18, 2023 at 5:09 MST

Translation

My megaboom no longer connects via Bluetooth

⟐ Edited June 11, 2023 at 9:18 MST

It will flash like it is charging for around a minute then the light will go out and nothing happens. If I turn it on while plugged in, it will turn itself off after around 10 seconds unless I am running something through it. I have tried resetting and replacing the battery with the same results. The speakers crackle at high volumes but I am sure this issue is unrelated.

It would be a shame to throw this thing away because they are great when working properly.

The only thing I can think is that it is not charging because initially it was turning off and on every few seconds but now I also get the critical battery warning if I don’t play something through it. So the power must be getting through.

Any ideas????

thanks

⟐ Answered May 08, 2023 at 10:26 MST

1) Ed Sheeran plays a full volume "shape of you" when i hit the big circle. The speaker goes: "welcome!! etc etc to your new boom 3..."

2) It turns off after 20 minutes

I tried the solution at: Megaboom 3 cannot downgrade demo mode firmware (v31.0.11)

It didn't fix these problems. When i run the application it just tells me my boom 3 is at the latest version

Advice?

⟐ Answered May 08, 2023 at 10:24 MST

⟐ Answered January 23, 2023 at 20:45 MST

⟐ Answered October 26, 2022 at 7:25 MST

My iPhone uses R&B as the equaliser.

The Charge 4 takes every song I throw at it like a champ. The bass is fine, and slightly reduces if it’s too loud.

The UE MegaBoom 3 however is making a ‘thunk’ sound for its bass when the volume is above 50%.

I’ve used smaller BT Speakers, like the Dell ad211, and when the bass is roughly 70%, it makes the same weird ‘thunk’ sound with the bass.. and it sounds terrible. However this is a very old speaker.. 10 years or so.

Could anyone else test for me to see if they can reproduce the issue?

If this cannot be reproduced, have I got a bad UE Megaboom 3 speaker?

iPhone EQ = R&B

Song: Flawless - The Ones.

Alternatively, use this song.

https://www.youtube.com/watch?v=8b-FEaGJ...

I’d ask on the Ultimate Ears reddit, however they only have one moderator or something, and it’s closed to invitation only and there hasn’t been a post for literally 30 days. The slash is basically dead.

⟐ Commented August 28, 2021 at 4:07 MST

Pairing works fine and I can play music immediately from my device, but there is no sound, not even the startup sound from the speaker. After about 5 minutes the sound will suddenly start (sometimes with a little crackling). It then works fine for as long as I use it.

I tried a factory reset, re-pairing but no change.

Anyone have any ideas about this?

⟐ Edited by author August 12, 2021 at 13:25 MST

Stains appear to remain and not disappearing

⟐ Commented July 13, 2021 at 8:59 MST

When I took out the battery and then plugged in the light started blinking but when I inserted the battery again it's still the same outcome.

I have read all the previous questions posted here about this issue and none have a solution. Can I play my speaker like this only plugged in?

Is it bad for the speaker to run on only the wall electricity? as the battery or current going to battery is not working.

Any help would be appreciated please guys

⟐ Answer edited June 02, 2021 at 19:05 MST

⟐ Answered May 29, 2021 at 11:20 MST