I like my heated vest. I bought it as opened package but it's in great condition so I would've thought it was brand new. I previously had a full heated jacket and the battery pack was in the back. This vest it's on the left side. I gave it 4 stars because it really bothers me that the battery pack literally sits right on my hip. I don't mind it being on the side because then it's not digging into your back when you're sitting, I just really wish it was higher up on the vest side. Like the middle of the left side would be perfect. You can still get to the battery pack easily but then it's not sitting right on the hip.