I do not know if you all know this but I did not. I was setting here at my desk trying to get this computer working proper before midnight, and I suddenly heard an explosion. It sounded like a small gun shot. I jumped thinking my new refurbished computer may have exploded, or the screen. I was surprised to see a rope chain drop out of a small box I have on the monitor stand and fall onto my keyboard. I then remembered the button batteries I had in that box and wondered if they did it. Sure enough one of them had exploded so hard it blew the top off the battery. I did not even know they would explode like that. Did you? I am now wondering if I should take the other ones I have stored in my desk out. So everyone be careful with button batteries they can be explosive.