So IMR is safer? I thought everyone said the protected batts are safer.

Now I'm all confused. Is a multimeter the same thing that tells you how many volts your PV is vaping at? Also is R and R manufacturing out of business? I can't pull it up. They're the ones that make the Jouneyman right? I wanted to read what the manufacturer says about the journeyman. You can't buy them new anymore? Thanks again.
Edit: It looks like lighthound only carries 1 battery in that size and it's the AW unprotected IMR red battery. Is that the one I should be getting? I did find that battery a little cheaper at RTDvapes. I was told maybe I should get the protected with the black jacket. What would the difference be. Is one more powerful or last longer? What is the difference? This battery stuff is so confusing.