Problem --- Issue with battery with Vamo V3 Use either the flattop or button top and stick with one. I have a collection of batteries 18650 and 18350 both flat top and button top. They all worked. But over the weekend I used 3 button top bat's back to back. Now the flat tops don't work in the unit. I figure since the button top bat's are a little longer they must have slightly bent the top contact so it no longer make contact with the flat top's. Will try pull it out. But in the future I need to use one or the other????