To be honest, I've never owned that battery but trying it out at a B&M along with an employee didn't like the power it put out compared to the VTC5, there are a lot of people who like that battery, but the Sony performs better, if it's your first battery for sub ohming, and you haven't tried a Sony VTC4 or VTC5 you won't know what your missing anything, so if you're happy with it, that's what matters, just make sure it fits all safety issues and builds. Sorry I can't say that battery is or isn't safe, because I'd be making things up if I did and don't want to jeopardize your safety or anyone reading this post.