Thanks Keys, to post a link you just copy & paste from the address bar of your browser. Here is the link to that batt:
16340 Li-ion Battery 1000mAh 3.6V 4 Pcs - DinoDirect.com At least I assume this is the one you refer to. It says "Free ship worldwide" so the price certainly is extremely good. However, I do not know where they are shipping from (guessing China - if so, could take a week to several weeks).
I am not a battery expert and have not before come across "IR" batts. So I do not know how these compare to the IMR or the Lithium Ion versions I posted. I will forward the link to someone who KNOWS and ask his opinion. This person is, by far, the most knowledgeable person I have come across in my vaping research (especially in the area of electronics). What I can say is that He strongly recommends the IMR - even over the Lion. He also has strongly recommended I stick with AW batts. The only problem with the IMR (designed for "High Drain" - in the 16340 model - is they are lower mAh = 550 and therefore require more frequent charging. Of course, they cost more too.
Remember that you are "stacking" batts in an extremely high-drain use. Think of the rate of drain on batts in something like a flashlight vs a PV - the flashlight batts take months to drain compared to hours in a PV. Personally, under these circumstances, even tho everyone likes a "good buy", I tend to not squeeze the nickel when it comes to batts and chargers. I look for the best batteries and then look for best price for those batts. I will ask my friend and get back to you about these IR style batts.
FWIW, I also keep my batts paired using and charging them in their assigned "pairs". I mark them so I always know which two batts are paired to each other. This keeps the charge and drain levels equal in each pair.