SOURCE: My cordless HDR 130 Sennheiser headphones no
The batteries are at end-of-life OR your charger has failed.
Forst replace the batteries... they are MOST likely bad. Charge the new ones before using.
SOURCE: sennheiser hdr 120 headphones no longer hold a
Twist the pad counterclockwise on the left earpice. You'll find the batteries underneath.
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