On my husband's Reo Grand we are having an issue. It seems like maybe it is getting WAY, WAY, too hot. The spring that touches the battery on the bottom is getting hot. I don't mean warm, I actually now have a blister on my thumb where I touched it not realizing how hot it was and the spring has now changed color and is staying compressed. On the top part where the button connects with the little metal piece that touches the battery melted onto the metal piece and was stuck to it. Has anyone ever experienced this? We used 4.8 v Nihm batteries and I was wondering if this could have caused it. I also have a Grand and am now wondering if I should not be using these batteries. I know a lot of people use these batteries so i am wondering why his melted? Thanks for your help.