How to Replace the Battery on the Sony ULT WEAR (WH-ULT900N) Wireless Bluetooth Headphones (DIY Repair Guide)

Does your Sony ULT WEAR (model number WH-ULT900N) refuse to power on, require frequent charging, shut down unexpectedly before the battery reaches 1%, experience reduced playback time, or appear as fully-charged when plugged into a power source? If your headphones experience any of these symptoms, it’s time to replace the battery.

In this DIY repair guide, we show you how to disassemble the Sony WH-ULT900N headphones, replace the battery located in the right earcup, and reassemble them at home. You will find all the tools that you need for this repair, along with the OEM spare parts, below.

Want to get your headphones repaired by a professional? Send us your Sony WH-ULT900N today using our mail-in repair service. Follow the link, select the issues you’re experiencing, and click See Estimated Total to view the total repair cost instantly.

Repair Difficulty

Moderate / Requires 20-25 minutes to complete.

This repair involves carefully handling delicate internal components, including ribbon cables and small screws, and precision tools. You don’t need technical skills or experience to complete this repair. With a bit of patience and attention to detail, you can replace the battery on the Sony Wh-ULT900N headphones yourself.

Replacement Parts You’ll Need

Restore the battery health and longevity of your Sony ULT WEAR headphones with original replacement parts. Select the OEM spares from the drop-down menu below to bring your device back to peak working condition.

• Sony ULT Wear WH-ULT900N Battery 702428 520mAh OEM Replacement Parts (model: 702428)

Get OEM replacement batteries for your Sony WH-ULT900N headphones today. Click the link to visit our store, add the product to your cart, and check out to receive the original spare parts. If you prefer not to repair it yourself, we also offer a mail-in repair service for the Sony ULT WEAR (WH-ULT900N).

Tools You’ll Need

Before starting the battery replacement on your Sony WH-ULT900N headphones, keep the following tools at hand. Using the correct tools will help you complete the repair while protecting the device’s delicate internal components, including ribbons, connectors, and circuit boards. We used the following tools and recommend them for a safe, professional-quality DIY Sony WH-ULT900N battery replacement at home.

• 1.5mm Phillips screwdriver
• 1.5mm flathead screwdriver
• Strong Metal Pry Tool
• Precision Tweezers
• Heat-Proof Anti-Static Rubber Work Mat

Not ready to invest in tools yet? Find your device in our repair catalog, select the issues it’s experiencing, and send it to us. Our repair ninjas will restore your device to peak working condition.

Step-by-Step DIY Guide to Replacing the Battery on the Sony ULT WEAR (WH-ULT900N) Wireless Bluetooth Headphones at Home

In this detailed repair guide, we show you how to replace the worn-out or dead battery on the Sony WH-ULT900N wireless Bluetooth headphones at home. Follow the instructions and refer to the corresponding images to restore your device’s battery life.

Step 1: Separate the Right Earpad Cushion

1.1. Insert a strong metal pry tool in the seam between the earpad cushion and the earcup and gently pry the earpad off.

1.2. Remove the foam cushion.

Step 2: Separate the Rear Touch Panel

2.1. Unfasten the 4 small screws using a 1.5mm Phillips screwdriver. You may need to use precision tweezers to extract them.

2.2. Insert a flathead screwdriver in the edge between the touch panel and the earcup and gently press outward to push it off.

Step 3: Disconnect the Battery

3.1. Flip the touch panel over to reveal the battery. Disconnect the ribbon cable using a flathead screwdriver.

3.2. Insert the pry tool under the battery and apply an up-and-down motion to peel the battery from the earcup.

Step 4: Install a New Battery

4.1. Take a new OEM replacement battery and place it on the adhesive patch on the earcup for a secure fit. If the old adhesive is worn out, apply a fresh layer of Joe’s cold-press adhesive.

4.2. Connect the battery wire to the main circuit board.

Step 5: Reassemble the Sony WH-ULT900N

5.1. Place the rear touch panel back over the earcup.

5.2. Flip the earcup over and fasten the 4 screws.

5.3. Put the foam cushion back into place.

5.4. Align the hump on the earpad cushion with the notch in the earcup and press the two sides together.

Congratulations! Your Sony WH-ULT900N Headphones are Ready to Use

You have successfully replaced the battery on the Sony WH-ULT900N headphones. Check the audio quality, buttons, and Bluetooth pairing to confirm the device is working properly.

If you found this guide helpful and would like to try your hand at DIY gadget repair, visit our store for essential tools and spare parts. You can also check out our at-home DIY headphones repair guides for other popular brands, including Apple, Beats, Bose, and Sony.

Have questions or suggestions about this repair? Text a repair ninja or email us, and we’ll reply shortly.