7.4V 4200Mah Rechargeable Battery for ARRIS Newest Heating Waist Belt or Heated Knee Wrap

I've had to order three of these EXPENSIVE batteries for my waist belt within 5 months. The charging port for the first two both broke, the second one actually pushed into the battery, and no longer work. I have chronic back pain, if I didn't need the belt I certainly wouldn't be buying another but I really can't afford yet another belt to boot. Buy something else.

perfect for my heat belt