I need a heating pad to cover a medical device. Space is at a premium so it needs to be small. I currently have a sample of conductive fabric a 3.7v lipo battery and a charging board from adafruit. If you can produce a system that is small, (the constraints for the battery and board are 5.7" x 2.7" and a depth of .5") (the heat pad will be approx. 6" x 9") I would like to talk with you.