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
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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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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.
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Use the drenched cotton swab again if the battery sticks in place and cannot be removed easily.
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After removing the battery clean the sponge rubber from any residual glue.
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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.
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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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Your done!
Your done!
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