Find the junction between the electronic circuit and the earbud battery just below it.

Using an Opening Pick or a very thin plastic tool, very gently unstick the circuit board from the battery by inserting the Opening Pick between the circuit board and the battery.

The circuit board sticks directly to the negative battery terminal with adhesive.

Caution: There is a tiny metal contact under the circuit board that makes contact with the battery. Unstick the circuit board gently to avoid damaging this contact.

Do not use metal tools in this step as you may short-circuit the battery.

Once the circuit board is unstuck from the battery, lift it up as shown on the third picture to have enough space to remove the battery.