What is this red stripe inside a headphone?
What is this red stripe inside a headphone?
![](https://lemmy.world/pictrs/image/77aec703-dbe0-49d9-acda-41687ce4525d.jpeg?thumbnail=1024&format=webp)
Headphones felt hot to the touch and these stripes appeared on both headphones. Checked the battery and it seemed fine, not swollen. Still functioning.
JBL 510BT
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