LOL!!!! I'm sorry to say that the tie on ones I have are not battery or plug adaptable, they get heated in the microwave. Most of the ones I have are called "MediBeaRAB", they come in all different sizes, many with ties, and for many different body areas. I personally like these best, and even tho they are microwaveable, they do give off moist heat. And the fact they have ties is a big plus! I do also have one of those massage/heat car seat paRAB that plugs into the A/C adapter in the car, but this doesn't do the trick as well as the microwaveable ones for me, anyway. What we really need is a microwave in the car! haha