Hi @mariospal ,

The battery in the headphones needs to be replaced. Even rechargeable batteries have a life span.

Here is a link to the ifixit Turtle Beach Ear Force Stealth 500P Battery Replacement guide.

Here is a link to just one supplier of a replacement battery. It is not a recommendation to use them. It is shown to give an idea of the cost of the battery. There are other suppliers online who may suit you better. Just search for FT603048P. This is the part number for the battery.