Battery Mod a Portable Bluetooth Speaker




Introduction: Battery Mod a Portable Bluetooth Speaker

Replace a portable bluetooth speaker's batteries with larger capacity quadcopter batteries. I'm using a G-Boom bluetooth speaker, but the principle can be applied to any portable unit. All you need is a new battery(s) that matches the voltage of your old batt, and matches or exceeds the mAh rating, and will fit within the speaker.

Step 1: Remove Battery.

The battery was housed in the bottom right compartment of the speaker. I removed it because it was swollen.
But, you can see it in the attached photos.

You will notice that it's a 7.4 V 1800 mAh lipo battery. This is a common battery used in RC controlled devices, which means, I can easily find an exact match or that will last longer.

The current battery specs boasted a six hour run time per charge. I want moreā€¦

Step 2: Replace Battery

I purchased two Floureon 7.4 V 1200 mAh batteries from Amazon for around $13 each. I placed one in the left bottom compartment and the other in the right bottom compartment .

Next, I soldered the two battery leads together in parallel for a total of 7.4 V 2400 mAh.

The additional 3 wires are for charging individual cells within the battery pack. I won't be needing this added functionality.

Step 3: Reassemble

Step 4: Calculations

I calculated that the addition of two 1200 mAh batteries connected in parallel to replace the one, factory installed 1800 mAh battery, would increase my operating time by 33%. Thats an additional 2 hours of music over factory spec for a total of 8 hours.

However, after two charge cycles and two run tests at moderate volume, I was only able to achieve a 7 hour and 20 minute max run time. I'm a little disappointed.

I did increase the run time with this mod, as I set out to do, but not as much as I had hoped.

Step 5: Completed Project



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15 Discussions

Thanks for the writeup ecrouch!

My G-BOOM was dying after an hour or so of loud playback. I used your instructions and replaced the stock battery with a Tenergy 7.4V Li-ion 18650 2600mAh last week. I'm getting about the same play time as you now - about 7hrs at fairly loud volume.

7hrs is plenty, but if I was doing this again, I'd probably go with the 7.4V 3400mAh Battery Pack from XpressTek instead of the 2600mAh Tenergy. The XpressTek uses Panasonic Cells and should provide about 30 percent more runtime, or a couple more hours

If you can find a battery with the same connector, that will save a bit of time soldering

The dual 18650 cell package is not a great fit for the G-BOOM. A larger pouch cell would probably fit better. You dont want to put any pressure on lithium batteries, which is why I installed mine like the picture below


Pull the rubber boot off the bottom, which exposes 3 of the screws. The 10th is under the center panel, which slides up as described by StephenS220 below

One replacement battery is named: "Tenergy 7.4V Li-ion 18650 2200mAh Rechargeable Battery Module". It can be used as a replacement battery in a G-Boom speaker that won't charge or won't turn on. Take the screws out of the back, including the center screw, which you have to slide up the long gray piece on the back to reveal. Detach the old battery by pulling out the white connector. You may have to use the point of a knife to carefully remove the glue on it first. After detaching, cut the red and black wires, leaving wire on the white connector so that you can reuse it. Strip the ends of the wires on the connector and on the replacement battery so you can join them together - red to red, black to black. Twist the wires together. You can solder them if you know how. Cover with electrical tape. Reattach the white connector to the G-Boom. Picture of finished product:

1 reply

Nevermind, it stopped working after the battery's initial charge was gone. :-(

I installed a lithium ion battery (as listed in the specs) which fit really well in the case and appears to have much better battery life than the stock battery.

Li-Ion 18650 7.4V Tenergy 2200mAh Rechargeable Battery module with PCB

I'll comment back if anything changes but it seems to work perfectly so far.

1 reply

Hi, I just ordered the same battery that you are using. You are charging yours with the original G-Boom charger, correct? Is it still going strong with the new setup?

Okay so I did some research and found that this Bluetooth device is listed as having a lithium-ion battery, not a lithium-polymer battery. This is odd because it looks like my RC lipo batteries. I ordered a 2200mah 7.4V lithium-ion battery and will reply when I have it installed. I also am aware of the dangers of RC lipo batteries. I suggest that everyone be very cautious with this mod.

lithium batteries are dangerous if charged incorrectly. especially if charged in parallel; as the charger is being "decieved". They use an "intelligent" method for controlling current flow. Potentially resulting in explosion and fire, due to excessive heat if one cell array is fully charged while the other is still being charged.

2 replies

Thanks Shaun. So, the original batt was 7.4 volts at 1800 mAh. What would you do to increase usage? Should I have just bought one batt with the desired mAh (something greater than 1800)?

I'm currious about this also. I'm looking at using your instructable as a bit of a guide in doing the same with my G-boom. Have you had any problems since you did this? Overheating while being charge Do? Etc. Also how much room is there inside for battery placement? i.e. two 2400 mAh batteries. I've also considered buying an inexpensive cordless drill for its battery well, battery charger and a couple of rechargeable battery's for it. Pretty sure I can find one that matches the voltage of the G-boom. But that seems like to much work when I can put more inside like you did.

Thanks! I also need to replace my G-Boom battery.

I have removed the 9 batteries and still cant get G-Boom to open. What am I missing?

1 reply

There is a tenth screw in the rear center, under the grey panel. Slide the grey panel up to remove the screw.