90 minutes of runtime per charge. http://www.bit-tech.net/news/hardware/2016/11/11/htc-vive-tpcast-wireless-kit/1
I will let others try it first before I buy one. But I am interested, just wonder how much extra weight it adds to the headset.
Problem is that doesn't allow for microphone and the Vive mic is a pile of cack. Thus I use wired gaming headset. Would need to buy wireless headset.