When the headset cannot be charged, it may help to try thoroughly cleaning the charging ports.
Charging ports that needs maintenance
Headset
B: Charging ports of the headset units (left, right)
Charging case
C: Charging ports of the charging case (left, right)
Note
Do not use an air duster, etc. to remove dust, etc.
Dust, etc. may enter the sound output part of the headset, which may lead to malfunction.
Cleaning the sound output parts
The sound output part of the headset unit is designed with a mesh-like structure.
Wipe off any dirt or earwax on the mesh and groove parts of the headset unit with a cloth that has been moistened
with water and wrung out well.
Remove the dirt so that it does not push into the mesh part of the headset unit deeply.
D: Mesh
E: Groove