Changing the oem battery into 18650 li-ion cell

Upgrade the capacity

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  2. To get the battery out, you have to take out the right side radiator.
    • To get the battery out, you have to take out the right side radiator.

    • - Notice there is two plastic latches, you need to lift both up using some small metal part as the leverages

    • - While both latches are up and hold the speakers, trying to turn the radiator anti-clockwise

    • - This can be hard as first but no worry and there is no cable connect to the radiator

    • - As you turn about 1.5cm (or can not turn further), just take out the radiator cap

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    • Disconnect the cable connect to the battery to the board inside the speaker before taking out the battery

    • The JBL battery is Lithium Polymer

    • Brand: GreatPower

    • Model: GSP1029102A

    • Rating: 3.7V 6000mah 22.2 Wh

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    • Option A: is to purchase the exactly same battery then replace it. It is straight forward. No explain needed.

    • Option B (my choice): is to replace with the readily available Li-ion 18650 to save the time order from China and can be assured of the capacity.

    • I decide to pick up 3 cells from Panasonic 3400mah NCR-18650B. Two un-protected and one protected.

    • WARNINGS: make sure all the battery is same voltage before replacing in the speakers | CAREFUL not to short circuit them. Maybe balancing and equalize them.

    will it be an issue if I use 3 Protected batteries instead of 2 Protected and 1 UnProtected?

    Naseef Fatemi - Reply

    What do you mean with 2 unprotected and one protected.

    Maman Spoon - Reply

    Can I use only 2 pieces of Sanyo high capacity 18650 unprotected battery? Thanks…

    Ninoneil Jimenez - Reply

    • You need to wire them in Parallel (i.e. 1s3p pack).

    • Two unprotect will be wired to the JBL BMS board. I solder the black wire to the B+ and the red wire to the B-.

    • For easier next time replacement, I only connect the battery by twist the color coded wires together and wrap with electrical tape

    • One unprotected cell will be in the original battery compartment inside the cell holder (as shown) connect to one side of the BMS board.

    • Two cell will be inside the speaker compartment behind the Bass Radiator. The unprotected one (right hand side radiator) will connect directly to the BMS board

    • The protected one (after I open and rearrange the PCB of the battery for better fit into the speaker compartment) will connect parallel to the protected one from other side of the bass radiator.

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    • For your reference. After Finished!

    • NOTEs:

    • I put a few pink foam to make sure no rattle of wires, secured everything and heats isolation (if any :))

    • The cell holder is glue to the battery compartment by silicon.

    • The cells in the battery compartment is just right side and just barely fit so will stay in place without any glue.

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    • Putting everything back in reverse order.

    • Careful with the screws, they can be easily stripped.

    • For a peace of mind, I use plumping tape to ensure 100% waterproof as after all we may have temperer/opened the original speaker seals.

    • Note: make sure everything complete seal, otherwise you will hear the rattles noise from the speakers when you play heavy bass songs.


    Hi NGUYEN Anh, can i use 26650 5000mAh battery instead of 18650 3000mAh to replace the original battery? Soldering it to left and right of its BMS? Hope you reply the soonest! Thanks man. :D

    MarHarBet - Reply

    You think 26650 battery will fit? 26mm x 65mm? If you can try to fit it, i’ll finally buy this battery that clearly has more juice in it. :D

    MarHarBet - Reply


To reassemble your device, follow these instructions in reverse order.

3 other people completed this guide.


Member since: 09/23/2017

207 Reputation

1 Guide authored


Cant i only replace the one 18650 battery? Or do I need These silver packs?

Robert Rpunkt - Reply

You probably can use only one 18650 battery but then your speaker will run out of juice much quicker ^^

The way I connect everything is parallel so if you only use one then just direct soldering to the positive and negative of BMS

Note that you can only charge the battery only when you connect the battery through BMS.



Just wow.. I have never seen an ifixit teardown that simply links to a YouTube video…. To make matters worse, the video isn't even informative… it is sped up and there is no voice over explaining what is going on…. Instead, you get some awful music playing… have you looked at other teardowns on this site to get an idea of what to do? Thanks for the effort, I guess, but back to the drawing board

Mike - Reply

Hi Mike, my intention is just want to show how to replace the battery. I think the tear down (the easy part) just would be more effective to see the video. Guess different views on the matter. The hardest part is to open the speaker bass radiator are shown and explained. But thank you for the feedbacks.


Hi! How are you? Some bottom leds are failing in my charge 3. Do you know if this could be repaired? Does it afect any other function? Thank you! Dario.

Dario Perales - Reply

Hi, I do not know if you can replace the bottom leds. My guess it would not affecting the function of your speaker, you can test when open it up and checking the charge on the battery to see before charging and after charging is 3.7 volts. Meaning it is charging and how long the speakers battery should last 10 hrs per charge on high volume.


can u both use the stock battery and 18650 battery ? thanks

nuelanianatienza - Reply

You can use either stock or this way 18650 batteries. But this way will increased the capacity!


Is it okay to use 3 protected batteries instead of 2 unprotected and 1 protected? Would that make any difference in the process or connections?

ankush4play - Reply

It's perfectly fine, I have done that and be using for almost 1 year now. The capacity is greatly increased and living it ;) of course for safety you can use 3 protected (however you need to pay attention to the limited space you can fit in the internal of the charge 3)


Hi can you please post a diagram on how to connect 3 protected batteries? I have no knowledge in batteries so im really confused. Thanks.

Bart Bernabe - Reply

Its quite simple with the 3 protected batteries. They are exactly the same with the 3 unprotected. You just need to connect red to - sign and the black to + sign.

The only thing is that you need to open up the protected part out to separate and electrical taping the wires in the correct terminal. I play around a bit.


Can i just use 2 batteries? I will connect one battery on + and negative on the left side of the board and the other battery on the right side of the board? Do i still need to wire both batteries to each other or not?

bartjeb_21 -

hi, off course you can still use only 2 batteries. not a problem. Only the capacity will not as good as original (bit less).

If two batteries then, just connect one on the right and one on the left of the board. :)


Guess that NGUYEN Anh is Vietnamese, may I have your contact? My JBL Charge 3 need to replace the battery now.

Contact me via email please

love_you_forever67 - Reply

haha, the name is obvious. You live in SG?


Yes, waiting for your email. Need to replace the batter asap.

love_you_forever67 -

if you would like to replace then plz contact my email, I’ll help and guide in my best knowledge but do not have time to do it for you :)



It’s great idea, but in my Charge 3’s passive bass radiator was stopped! Not fit for mine!

Albert Einstein - Reply

What do you mean?


Why not? The JBL impruve his only battery fitting?

Albert Einstein - Reply

After reading more intensively on equalizing more than 1 battery together, even if they are protected, its my conclusion that this project while seemingly fun might be more trouble than its worth. Its best to just buy an upgraded battery.

Mech nen - Reply

I do not think so, because with extensive usage. My battery will die out after 1 year, plus with new model coming out, the stock battery will no longer available. So using 18650 batteries is best option. Once setup, just replace the batteries, even if they are not equalize probably, they are fine will definite last long. (also consider the cost is cheaper).


Thanks sir.

It works,i put 2 (18650) battery like you.

I'm happy with this..

Thank you…

Imam Abu tholib - Reply

Hi NGUYEN Anh, can i use 26650 5000mAh battery instead of 18650 3000mAh to replace the original battery? Soldering it to left and right of its BMS? Hope you reply the soonest! Thanks man. :D

MarHarBet - Reply

Hi MarkHarBet, the battery 26650 is too big to fit in the limited space within. So 18650 will be best option, I just barely manage to fit 3 in. Thx


You think 26650 battery will fit? 26mm x 65mm? If you can try to fit it, i’ll finally buy this battery that clearly has more juice in it. :D

MarHarBet - Reply

Will replacing the battery effect the waterproofing in any way?

Prashant Arora - Reply

I take the precaution, that’s why i use some plumping tape to water-proof around the two radiators. After done that, I have test in the rain first and throw in the swimming pool. It is fine, but of course don’t over do it over long period of time (5-10 min max). Under the rain is absolutely fine.


Good day everyone, first wants to thanks author for good job, i planned to do so with my JBl 3 long ago, as the battery start dying…

When I disassembled the speaker, i was fck amazed, my batteries become doughnuts) i wandered how the cover not damaged or smthg… cause they really become twice a size.

But I write this to warn people, when i disconnected old batteries from BMS (note that I didnt short circuit the battery 100%) this plastic package of the battery opened, through the gap, when i cutted the connections one by one, and the gas from inside came out, fck buttery burned in a second), its good that not to the face but aside…

Anoter word Guys, if your old battery become a ballon, be very fck careful, shis gas inside flame at once when react with oxygen….

Good luck every one and Safety First

Vladimir - Reply

Right on it. I also nearly short circuit one of the battery, so yes have to be very careful. Thanks Vladimir


I agree with Mike. This isn’t a very good “Tear Down” at all. The video doesn’t even complete the tear down. For most users, they won’t even bother with doing the modified battery and neither the instructions on this page or the video gives any instructions on how to just do a stock battery replacement. This gets a thumbs down from me.

Bobby Gorden - Reply

Thank you Mike for your opinions. My intention is to upgrade the stock battery with the 18650 batteries what are widely available. Plus, I am not very tech savy, my wish was to do a proper video for the whole process but do not have right equipments and time constraint.


i dont understand how you connected the batteries to the bms board were all 3 batteries connected in parrallel or only 2. the two in parallel were they soldered the the b+ and b- of the board and the single one was soldered to the opposite side of the board on its own??

David “WCxColosus” Cabrera - Reply

Yes, all the 03 batteries are parallel. Two on one side and One on the other side as you mention.


What are the steps for replacing the battery if you buy the same battery? Is it as simple as plugging it in?

Bob Smith - Reply

Hi Bob, if the stock replacement batteries come with the BMS then it's simple as replace and plug in (as from the time I try to buy the stock one there is none in my country). Plz contact the provider.

But if the stock ones are only batteries then you need to reuse your BMS, required you to solder the battery into the BMS.


How many hours do you get in your jbl charge 3 on a full charge?

Arjun bava - Reply

At right now at 50% volume, I manage to get around 25 hours or more. I do not keep track exactly but Its like forever until I need to recharge :)


Nguyen, Quick question…. About Using the 2 unprotected batteries in parallel with 1 protected attached to the BMS board, could you explain what benefits you get by having the 1 protected with the other 2 unprotected. Does the protected battery’s chip enable the other 2 cells more protection ? Are you counting on the JBL Charge’s BMS board to provide that layer of safety ? Please explain the reasoning if can, i’m very interested.

Also , if you ever decide to update some more photos, ie. both the sides of the BMS boards solder points, or perhaps an explanation into why the 18650' batteries you have shown in the photo are wrapped in plastic bags for the solder photo but once installed their wrapped in black electric tape. Thanks dude ! Your awesome !

Mech nen - Reply

Im beginning to think the unprotected cells weren’t just to get a longer life but also based on cost .. right ?

Mech nen - Reply

I was able to get the same model of battery online and I plugged it in. When I plugged the charger in the led light of the Charge3 was blinking abnormally and not the consistent blinking. Is this a problem?

Bob Smith - Reply

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