Okay so I've been using 3 of these cells in my new RX200 "S" model Wismec Reuleaux and they are lasting enough for a night of chain vaping a TF-S6 .4ohm 40-100W max coil. This is in the TFV4's "Cloud Chaser" category of coils and it's advertised as a cooler vapor producer. It doesn't drink much juice and hasn't had leaking problems but it's important not to lean it as you vape for too long, however. I use 75%VG 25%PC Organic ISO certified safe self-regulated E-liquid I trust for years now. Bubblegum flavor 40ml bottles for 20 dollars which is good for a mom and pop shop, price wise. Anyway. I've used the Stentorian Steam Engine after finding a box of coils online and they're .25ohm dual 316 Stainless Steel NON TC (VW only) coils. These are equal in cloud making to the TF-S6 coils and both surpass the TF-T3 and TF-Q4 cloud chaser coils for the TFV4. I've tried all of the TFV4 coils that I've named since using this device loaded with the LG HB4 batteries. I only know of one site that sells them or if sold out, will restock asap. The 30amp and nominal 3.6V cells are 1500mAH which isn't ideal but lasts long enough for my purposes. I smoke Honduran and Nicaraguan cigars so as long as I'm not buying Marlboro's I'm better off for the time being. Anyway. I tried a set of three LG HD2 25amp 3.6 nominal volt 2000mAH batteries vaping at a good number 85W on the sextuplet .4ohm coil and it's satisfactory. The RX200S says on the box that cells should be at least 25amps. The HD2s are my next set but I'm enjoying the versatility of the 30amp power and voltage that I've never seen before. I think the power doesn't change as far as any user would notice up until it's time to recharge the set. VTC4s used to be my favorite batteries but these stay cool while running continuously, and don't "drop off". The HD2s seemed to be just as good in this department as well. I guess the LG HB6s are for mech mods running custom coils for advanced vapers because the HB4s are more than anybody who vapes as I do would need. I just hope the HD2 cells are at least a FULL 25amps and not 22amps or something different than LG claims. For example, the LG HB2s are NOT 30amps but LG rates them the same as HB4s and HB6s. Why would a company make 3 identical batteries. I know the differences between the HB2, HB4, and HB6 cells and know for regulated box mods running High wattage and high resistance coils, the HB4s are for this application. HB6s I can't fathom what kinds of vaping some people do with mech mods but that's probably why LG makes those. However the only issue is the 1500mAH being a tad too low for casual vaping. The TFV4 is a Subohm Tank with many super duper coils and lower resistance ones as well but I've decided to stick with the cooler 85W powered .4ohm Cloud Chasers that surpass the TF-T3's in vapor production and won't burn my lungs. I recommend the HB4s for .15ohms at 120W or so type of vaping but .2 or .3ohms under 110W, the HD2s should be enough. Does anybody know if the LG HD2 2000mAH "25amp" 18650s put out a full 25 amps?