Hi List I have been using the Sennheiser TS130 cordless headphones for approximately three years. I purchased them from Recycleit. I must say they have been really good but recently have stopped working. I charge them each night on the cradle ready for work the next day. My question is how long should I expect the batteries to last before replacement? If they need replacing, what are the best batteries to use? Finally, could someone recommend a replacement headphone if replacement should be necessary. Phil Roberts