I have both the RX200S and the Koopor Primus 300 and I would recommend the Primus over the RX200 mods. It's packed with better TCR, for those who use TC, I do not at all, plus a setting to adjust the initial ramp up hit strength from soft-hard with a few in between choices for the perfect vapor hits that will fit anybody's preference. The RX200 & RX200S both have soft and slow ramp up speed and firing punch. This is a huge issue for me because I've never had such a slow and soft initial hit of vapor before and I've used 20 different V/W 18650 box mods. Also all the Primus' three cells run parallel which means more battery life than the RX200s. Don't suggest LG HG2s, they become way too hot after a few consecutive hits. I think the LG HD4 18650 batteries (25amp, 2100mAH) are best for either mod because if you plan on reaching high wattage for something like a TFV8 Cloud Beast tank and remain able to vape at 140W-170W through your entire battery life, you need a new-gen LG Chem 18650. All of these are no less than 23amps, though no greater than 2100mAH each. LG HB4s are 30amps, 1500mAh or a bit more according to Mooch (1600mAH) and don't drop off voltage as soon as the HB6s that are 32amp 1500mAH according to Mooch with a short lived boost of power and voltage. HD4s beat out the 23amp, 2000mAH (in actuality) Sony VTC4s although I just purchased 3 of both batteries. And Sony is pressuring vendors and retailers of vapor gear to remove their batteries from their sites completely but one or two battery sites have the newest batch of VTC4s with appropriate markings indicating authenticity. Besides, I've tested them so I ordered more since I'm sure they're real. I got mine from imrbatteries.Has anyone used this with the RX200? Does it have the same 510 connection issues as the tfv4? If so is there a fix around this?
Also, as far as batteries - would 3 LG HG2s be suitable and capable of safely firing the tfv8 up at 200w with the 0.15ohm coil? I'm struggling with the concept of using 3 batteries - does this mean everything is essentially divided by 3 when I'm trying to work things out?
How about the possibility of coil rebuilds as well? Not seeing anything in the way of tutorials yet but I know it hasn't been out for too long. On the other hand the coils do look extremely complex so maybe it's more hassle than it's worth. How long are people getting on these coils?