When I needed batteries for a gifted provari someone gave me I ended up getting I think of the Samsung VTC fives I can't remember the green wrap guys that everyone uses for stuff anyhow apparently they like weld the button top onto it. It made me a little bit nervous at first but then I realized there's people using magnets and I feel like maybe a welded button top is a better option. Especially since it's IMR batteries that I purchased it from and I consider them to be a relatively safe business when it comes to their products so if it was just going to explode on me they probably wouldn't sell it I don't know if that's helpful at all