Sony Linkbuds (WF-L900) Case Battery Replacement

Step 1 Drain the Battery

Try to ensure the battery is drained to below 15%. This reduces the risk of nasty surprises if the battery is damaged during removal.

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Step 2 Open Case

Sony Linkbuds (WF-L900) Case Battery Replacement, Open Case: step 2, image 1 of 3

Sony Linkbuds (WF-L900) Case Battery Replacement, Open Case: step 2, image 2 of 3

Sony Linkbuds (WF-L900) Case Battery Replacement, Open Case: step 2, image 3 of 3

Use a thin card or prying tool to remove the shell of the case.
Take note of the position of the clips, shown in the images. This will help you apply pressure in the right positions around the shell.

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Step 3 Extract Battery

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Sony Linkbuds (WF-L900) Case Battery Replacement, Extract Battery: step 3, image 2 of 2

Gently separate the battery from the case.
DO NOT allow the battery to bend.

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Step 4 Desolder the Battery

Sony Linkbuds (WF-L900) Case Battery Replacement, Desolder the Battery: step 4, image 1 of 2

Sony Linkbuds (WF-L900) Case Battery Replacement, Desolder the Battery: step 4, image 2 of 2

Apply insulation tape to cover one of the solder points. This helps avoid short circuiting the battery whilst desoldering.
Use isopropyl alcohol to clean the solder pads.

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Step 5 Install the New Battery

Solder the contacts for the new battery in place, ensuring the red and black wires are connected the same way as the old battery.
Once you are satisfied that the new battery is working as intended, re-insert the body of the case into the shell.