ik heb zelf al gecheckt of er een verbinding in het draadje niet helemaal lekker zat, maar alles zit netjes vast. ik weet niet wat er aan de hand is, help. :/

⟐ Answer accepted januari 06, 2024 at 19:28 MST

ik heb een Marschall major IV koptelefoon.

Wanneer ik de knop indruk om hem aan te zetten gebeurt er niets. Via de kabel werkt te koptelefoon wel nog perfect.

Hoe kan ik deze aan zetten zodat ik via bluetooth kan luisteren?

Marshall has no replacement or repair policy.... just a thanks for your money and here is a coupon towards another pair of headphones that probably will die ....

Sooo I’m trying to track down a batter with 3 wires thats 3.7 V 680mah 2.52Wh abd ive found a bunch ... but with only two wires .

Can I mod these replacement batteries at all ?

I know there must be a way to create something work just like this apparently proprietary battery .

Thanks in advance for any help or direction !

Original Battery (3 wires)

⟐ Commented december 11, 2019 at 12:16 MST

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

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).

⟐ Commented december 09, 2023 at 6:34 MST

⟐ Answered december 11, 2024 at 13:58 MST

⟐ Commented december 12, 2021 at 12:33 MST

The power button doesn’t work. It stopped working when the headphones were unfolded but would work when the headphones were folded up. Now nothing. Often when moving the headphones around with the button pressed, the indicator LED would flash super fast, like it was shorting, but the headphones now don’t turn on.

Is it okay to replace the non-working original battery with an average Lithium Polymer battery? It says somewhere that the original batteries are 680 mAh.

Hi @oldturkey03, so I have bought a LiPo battery, but turns out it’s without NTC. The original battery inside the headphone has NTC.

Can I just omit the NTC connection?

The connection inside the headphone:

The battery I bought:

⟐ Answered april 20, 2023 at 13:05 MST

I have bought a LiPo battery, but turns out it’s without NTC. The original battery inside the headphone has NTC.

Can I just ignore the NTC connection?

The connection inside the headphone:

The battery I bought:

⟐ Commented december 23, 2021 at 7:39 MST

⟐ Commented augustus 11, 2025 at 0:37 MST

⟐ Answered juli 01, 2024 at 7:52 MST

Here are the things i checked:

• USB connector: I connected to 5v and measured 5V on the PCB => seems fine
• fuse : I measured a very low resistance => seems fine
• battery : i unsoldered and charged it with a separate Li-ion charger ( seems ok ). I then measured potentials and found ( GND:0V, NTC:0V, VCC:3.7(ish)V ). I also measured resistance between GNC and NTC and found around 10kohm.

I think the problem comes from NTC, but I’m not sure to understand who this works:

• Am I supposed to measure 0.5*Vcc on NTC when the battery is disconnected ? And does it change when the battery is connected or charging ?
• if NTC was malfunctioning, shouldn’t i measure a resistance of 0ohms of infinite resistance ?

Thanks !

⟐ Commented januari 30, 2021 at 9:33 MST

⟐ Answer accepted mei 21, 2026 at 23:32 MST

⟐ Answer edited april 29, 2025 at 8:19 MST

I have not included my own image, but I've marked up an image to show what pieces I'm talking about.

Is there any way to replace/repair/fill in this hinge?

I am experiencing an issue with my Marshall Major IV headphones. When I plug them in to charge, the indicator light turns green after about a minute, which seems to indicate that the battery is fully charged. However, as soon as I unplug them, the headphones do not turn on at all.

I have already tried several troubleshooting steps:

• Using different USB-C cables and power adapters
• Leaving the headphones charging for several hours
• Attempting a forced restart by holding the power button for 15 seconds
• Trying to turn them on while they are plugged in
• Testing them in wired mode with a 3.5mm jack cable (which works)

Despite these attempts, the headphones refuse to turn on and only function in wired mode. Thank you in advance for your assistance.