Introduction

Changing the oem battery into 18650 li-ion cell

Upgrade the capacity

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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
  • 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
  • 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.
  • 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

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
  • 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 :))
  • 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.
  • 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.

  • GOOD LUCK AND HAVE FUN !!!

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Conclusion

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

2 other people completed this guide.

NGUYEN Anh

Member since: 09/23/2017

161 Reputation

1 Guide authored

17 Comments

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.

Cheers

NGUYEN Anh -

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.

NGUYEN Anh -

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.

NGUYEN Anh -

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!

NGUYEN Anh -

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)

NGUYEN Anh -

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.

NGUYEN Anh -

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 j.vu2@aol.com

love_you_forever67 - Reply

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

NGUYEN Anh -

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

love_you_forever67 -

Hello!

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

Albert Einstein - Reply

Why not? The JBL impruve his only battery fitting?

Albert Einstein - Reply

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