extend your detecting time with youer Deteknix headphones

I use the Deteknix Wireless Headphones most of the time. The charge on the transmitter doesn't last as long as the headphones. I started using a cell phone power bank(mine is 2200MAH) and don't have that problem any more. I just connect it to the transmitter. The transmitter stays charged. I place the transmitter under my padded arm cuff on my Etrac and I used some bungee to attach the power bank to the arm cuff.
When I get home I just have to recharge the power bank and headphones