I have a Milwaukee heated jacket and I love it! I've had it for several years and it still works great. It runs off of the 12v drill batteries. I typically get 2-4 hrs per battery...depending on heat setting. I like not having to wear a bunch of layers. I would highly recommend it if you get real cold like I do. They aren't really advertised to hunters like a bunch of other crap is so here is an amazon link...
https://www.amazon.com/Milwaukee-He...mp;keywords=milwaukee+heated+camo+jacket