Replace a faulty battery in Marshall Monitor Headphones

Introduction

Follow this guide to remove and replace a faulty battery in your Marshall Monitor II ANC headphones.

If your battery is swollen, take appropriate precautions.

For your safety, discharge your battery below 25% before disassembling your phone. This reduces the risk of a dangerous thermal event if the battery is accidentally damaged during the repair.

What you need

Step 1 Battery

Replace a faulty battery in Marshall Monitor Headphones, Battery: step 1, image 1 of 1

The battery is located in the right cup of your headphones. First you need to remove the ear cushion. Insert a spudger between the cushion and the cup and move it around the cup to remove the cushion.

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Step 2

Remove the four screws to take off the membrane from the cup.

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Step 3

Carefully remove the membrane part from the cup. Take care not to damage any cables.
The battery is glued to the board at two long sides. With a cotton swab drenched in isopropyl alcohol you can loosen the glue so the battery can be removed more easily.

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Step 4

Replace a faulty battery in Marshall Monitor Headphones: step 4, image 3 of 3

The battery is glued to two strips of sponge rubber who serve as spacers. Insert the spudger between the battery and the rubber to remove the battery.
Use the drenched cotton swab again if the battery sticks in place and cannot be removed easily.
After removing the battery clean the sponge rubber from any residual glue.

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Step 5

With a soldering iron remove the cables of the battery from the board. Take extra care to prevent the cables from touching!

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Step 6

Replace a faulty battery in Marshall Monitor Headphones: step 6, image 3 of 3

Prepare the new battery. You might have to shorten the cables a bit first. Take care here as well that the cable ends don't touch.
Solder the cables of the new battery one after the other. Start with the wihte/yellow and then the red cable. Then cover the already soldered cables insulating tape to prevent accidental touching when soldering the black cable.

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Step 7

Prepare two strips of double-sided tape (carpet tape) and apply them to the sponge rubber strips. Remove the protective film and place the battery. Press down lightly.

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Step 8

Place the membrane with the electronics back in the cup. Before putting the screws back in place do a quick test if the headphones work (turn them on).
Put in the screws, tighten them and reattach the ear cushion.

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