1. Battery life typically lasts for two to three years. If your battery is more than four years old and you are experiencing issues such as poor audio quality, it may be a good idea to replace the battery.
  2. To remove the leatherette cushion, carefully detach it from the headset on the side opposite the speaker.

3. Remove the two small screws (You could use the size PH00 screwdriver that comes along with the replacement battery). 

4. Once you have removed the cover, carefully detach the battery and replace it with a new one.
5. Hook the battery wires and gently pull out the battery.

    6. Replace the old battery with the new battery 
    7. Replacement battery part number is PL-202599-03