The electronics of a VV or VW mod have built in protection.
The self contained ( ie eGo and others ) batteries are as likely to "blow up" as a mech mod that uses a separate battery. As long as you are being sensible to start with. Both types use the same types of batteries and require the same type of care and caution. As for a battery "blowing up"... if you follow a few safety steps, that is unlikely to happen. Don't over drain and don't over charge... don't over draw the maximum amperage of the battery you are using. The newer high drain batteries can already handle a pretty high amp load... the lastest ones have upped their ability to even handle 30-50 amp loads which makes them even safer in that regard.
If you are using premade atties, clearo's and tanks... it's almost a non-issue with either type. If you are rebuilding, then just be sensible and test the coil before you use them.
Thanks, but im still kinda new to this. I only have vision spinner, Lavatube 2.5, and itaste 134. I'm not too sure that I wanna use a mech yet. I really want to but I've heard that you kinda gotta know how the batteries work and all that. Now that I know that the transformer can be protective using the adapter, I might just have to get it now lol