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Introduction

Over time or with overuse, batteries can become corroded. If you notice the battery life decreasing significantly or possibly a strange smell coming from the Sony WH-CH520, it could mean it's time for a battery change. Replacing a battery requires being able to handle tools in small electronics and soldering experience.

What you need

Step 1 Battery

Sony WH-CH520 Battery Replacement, Battery: step 1, image 1 of 3

Sony WH-CH520 Battery Replacement, Battery: step 1, image 2 of 3

Sony WH-CH520 Battery Replacement, Battery: step 1, image 3 of 3

Lay headphones flat against the surface with the ear cushions oriented upwards.
Pinch the cushion of the right labeled headphone near the edge of the device to carefully pull the cushion off.

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Step 2

Remove the three 2.5 mm screws from the headphones using a JIS #00 screwdriver.

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Step 3

Sony WH-CH520 Battery Replacement: step 3, image 3 of 3

Place one end of an opening tool against the edge of the base with the hook-like side pushing up against the covering.
Carefully pull the tool down against the edge to lift the covering.
Move the tool to different spots around the base of the headphones to pry it up until the covering comes off.

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Step 4

Carefully remove the film adhesive on top of the battery using a pair of tweezers.

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Step 5

Sony WH-CH520 Battery Replacement: step 5, image 3 of 3

Carefully pry the battery up and off of its adhesive using a spudger.
You can rest the battery in its well to prevent it from getting in the way later

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Step 6

Sony WH-CH520 Battery Replacement: step 6, image 3 of 3

Find the wires connecting the motherboard to the battery.
Remember which wires are positive and negative.
Using a soldering iron, carefully desolder the red and black wires from the motherboard and replace with the new battery and wires.