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Mid is a premium Bluetooth® aptX headphone that delivers superior audio and 30+ hours of playtime on a single charge.

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Battery replacement? (Soldering, series of questions, detailed)

So my Marshall Mid Bluetooth headset stopped working abruptly today. It turns off immediately and will not charge. I’m assuming this means the battery has kicked the bucket.

I’m trying to see if it’s possible to replace the battery, but unfortunately there is almost nothing on the subject. The only source I could find is replacement battery for Marshall’s MID Bluetooth headphones? which was unfortunately left dormant before the important questions could be answered.

Therefore, I’m making this thread in the hopes that I can get an answer to the question: "How can one replace the battery on a Marshall Mid (bluetooth)?”

As I have no experience with soldering, I have a number of sub-questions to this topic just to make 100% sure that I’ve covered all my bases. I apologize for my lack of knowledge, but I just like to be as careful as possible. Also, please feel free to explain everything as in-depth as possible, as if I’m a five year old.

THE BATTERY

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Above is a picture of the battery of a Marshall Mid (bluetooth). From the thread I linked, I understand the importance of correct dimensions and voltage, along with how to find these. I’ve looked around on the web and found this:

'''Would this battery work with the Marshall Mid?'''

I read in the other thread that the three wires are “negative”, “positive”, and “ground”. I kind of understand “positive” and “negative” (as all batteries have these), but I have no idea what “ground” is, and all the battery in the link tells me is that it’s got a “thermistor” (which some Googling did not help me understand in regards to this question).

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I’m having a strange problem guys. After a complete discharge of my marshall mids, i tried charging it, and it charged it 100%. But the phones stayed on for seconds, then it turned off. Tried 5 times and same results, it’s really strange… And now it won’t even turn on at all. When i press the power button, a red led blinks for half second. Now it doesnt even charge the battery. What can it be? Is there a possibility to buy a Marshall Mid Motherboard? (used a tester to test every wire and everything works fine. Also tried with another battery, and it didn't work)

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@Sebastian Bravo any solution found? Have 100% same issue

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hi folks.

Has any updates?

Its seems that i have the same problem

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@Dmitry Reznikov hello,

It's been quite a while so I can't remember all details 100%, but the tl;dr is that they did not get repaired.

I bought the battery that I linked to and got a friend who was experienced at soldering. We attempted to replace the battery of the Mids, but the new battery didn't work at all.

I don't know if it was an issue with the soldering or the battery. But I think it is the latter.

Good luck with your issue.

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I have been used solution with PCB replacement posted earlier and seems it's really work

Link: Battery replacement? (Soldering, series of questions, detailed)

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Same problem here. I ordered a battery with a 'thermistor' and will simply match up the wire colours to how they previously were & report back. It should be a pretty straightforward soldering job.

As far as I have understood a thermistor is something like a thermal regulator, likely to prevent overheating. Seeing I can't find anything like a 'ground wire' with this type of battery (I know grounding is something done in relation to batteries/electronics but that exceeds my rather limited knowledge), I think it should be a thermistor.

If someone could explain a little more though that would be great.

I'm assuming with the ground wire they might have meant the one labelled GND?

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The battery I bought.

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Good luck!

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Hi @mjennifer ,

The ground wire is the black wire from the battery (-ve terminal) and is connected to the GND terminal on the board. Ground is just a common connection and reference point used within electronic/electrical circuits.

The supply voltage is the red wire (+terminal of the battery) which is connected to the VBAT terminal on the board.

The yellow wire from the battery which is the temperature sense wire is connected to the NTC terminal on the board. There will be a thermistor already connected to this wire in the battery .

The thermistor is a Negative Temperature Co-efficient (NTC) resistor which is placed on the battery (usually inside the wrapping so that it actually makes contact with the battery casing) to monitor its' temperature.

As the battery temperature rises during charging the thermistor's resistance will decrease and this will be detected by the battery monitoring circuit in the motherboard.

If the battery temp rises too much or passes a certain threshold value as determined by the resistance of the thermistor the battery charging circuit will be disabled, preventing damage to the battery and also a possible fire situation from eventuating.

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I've actually bought the exact same battery, just waiting for it to arrive from HK. Please report back as soon as you've tried it. For what it's worth, a friend who is more technically inclined than I thought the battery we ordered should work as a replacement, but we'll see.

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Hi!

I bought this Battery:

“ MODEL 582535 SP5 3.7V 600mAh Rechargeable Battery For tachograph papago F300 “

It did not work (no charge process).

Then, I used the small PCB from the old (orginal Marshall) battery and soldered it with the new battery, replacing the pcb that came with it.

Now, everything works fine - yeah !!

No guarantee though that this procedure is safe and works for you, too!

Good luck and have fun!

Volker

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Hi, just wanted to close up this years old thread by documenting that replacing the battery in the Marshall Mid ANC definitely works.

I bought this battery on Amazon Germany: DC 3.7V 800mAh 603040 Wiederaufladbare Li-Ionen Batterie für Marshall MID Major II Major III Major IV Bluetooth Kopfhörer VDL603040 SR603040

Doing the battery swap is as easy as

1) twisting off the ear cushion on the left side (the one with the button)

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2) Unscrewing the 4 screws

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3) Unscrewing the 3 screws holding the PCB in place

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4) Unseating the old battery, which is most likely taped to the bottom by double-sided sticky foam

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5) Unsoldering the 3 battery leads, soldering the 3 leads from the new battery (red=B+, black=B-, white=NTC)

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...and putting it all together again in reverse order. Everything seems to be working including charging.

Have fun!

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Hi @trckndck,

Good job.

Please consider editing and adding to the ifixit Marshall MID bluetooth Headphones guide showing what you did .

This will ensure that it is easier for other users to find it rather than them just happening to come across your answer by chance in this thread.

No doubt others in the future will thank you for doing so.

Here's a link that may help.

How to Create a Guide

Moderator

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