I only use safer chemistry batteries in all my APV's. I do this Because I use low resistance atty's only and now for my mechanical devices am using rebuildables with around 1.0ohm coils... If you look around the forum and most vendors websites, you will find that a lot of the newer APV's will not fit a protected battery. This is because they are being manufactured with AW IMR's as the suggested battery to use. The safer chemistry batteries such as the AW IMR's can handle higher amp loads that are demanded from lower ohm coils. As I mentioned previously, the safer chemistry batteries will vent and not explode... I purchased some of the Efest 18350's to try out because a lot of people gave them good reviews, but I get better performance out of the AW IMR's in all applications. The only battery that is on par with the AW's are the Panasonic's, IMO...
Since Rolygate has 40 years in engineering, including gunmaking and battery systems, I tend to trust when he writes in topics:
http://www.e-cigarette-forum.com/forum/battery-issues/254690-protected-batteries-vs-imr-safety.html
IMRs came into popularity with the advent of VV mods that have short circuit protection built in, like a provari.
I think it goes w/out saying Dont buy cheap batteries, dont' buy cheap chargers, don't buy mods with no venting, or safety features (springs, circuitry in the VV mods) etc.
Really though, the vmod obviously DID what it is supposed to do............the spring collapsed. That is safety feature. I think all of this battery stuff is splitting hairs somewhat, because most of us are using good batts, good chargers, adn most mods today have safety features that earlier ones didn't.
Bottom line, in a vmod, we are not talking a high demand device.

However, an atty short is going to short out a mod, and the spring is going to collapse, regardless of whether you are using an IMR or the protected batts that came with the vmod.
I trust these topics, so here is a list:
http://www.e-cigarette-forum.com/forum/search.php?searchid=15472490