OK so steer clear of efest. I've been seeing those VTC4's all over the place. But what mix are they IMR, ICR and isn't there an INR battery too?
I was looking through ebay for Lithium Ion Chargers and sometime they will throw in a few Batteries. For instance i saw a single slot battery charger that came with two 18650 6000 mAh batteries. I'm thinking they are crap!
Also on another subject Does ProVape make a Sub Ohm Device?
The vtc4 (and most of the batteries we use actually) are hybrid safe chemistry batteries (nickel-manganese-cobalt, NMC). They combine the safety of pure IMR with the higher capacity of ICR. IMR stands for lithium manganese (round), INR for lithium-nickel (round), and Panasonic's NCR for nickel-cobalt (round). Those are hybrid chemistries. ICR is lithium-cobalt.
As for the batteries offered with the chargers you've looked at, they're probably unuseable for vaping with heavily overstated capacity ratings. I haven't seen any safe chemistry 18650s over 3500 mAh, and I don't think there are even any ICRs that come close to 6000 mAh (if there are I want those for my laptop battery pack).
Knock wood here that I got all of that right...
Provari... The P3 and the new Radius do subohm (.7 ohms for the P3 before the update, not sure how much now, .3 for the Radius), but are rather limited in wattage. 20w for the P3 and 40w for the Radius. With regulated devices there's no real point in going subohm, unless you're fond of tanks that have only prebuilt subohm coils (unless you use tc - which the Provari's don't do - in which case you are pretty much automatically below 1 ohm).
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