I just received my RS 180 wireless headphones. I connected them to my cable TV box audio out connections. I gave it a try without the batteries fully charged, but I got a good sound on the headphones. I then placed the headphones on the charger and the charge light turned off after a few hours (I assumed they were fully charged). I tried to use them again, but no sound on the headphones. The multi-function light on the headphones stayed on continuously, not blinking. I tried taking the batteries out and left them out for 10 min. or so, but when I put the batteries back in, the light stayed on continuously with no sound output. I tried fresh non-chargeable batteries and had the same results. Does anyone have a suggestion as to what I could do fix this problem?

Audio Players & Recorders - Sennheiser - RS180 Wireless Headphones