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Mid is a premium Bluetooth® aptX headphone that delivers superior audio and 30+ hours of playtime on a single charge. Its custom 40 mm dynamic drivers lend it a robust sound that balances clarity with just the right amount of bass – perfect for those who demand the best in sound. The on-ear design features a plush headband and 3D hinges that produce an ergonomic fit. Complete with black vinyl, solid metal hinges and brass details Mid is the embodiment of Marshall in a headphone

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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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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.

por

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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