how come everybody has to prove the other person wrong here? ECF community is more polite. you were polite but 9/10 times im corrected and even called dumb in a sly way that might go over a person without a 129 IQ after a test 3 years ago. I'm not always doing a great job preserving braincells either. I'm not dumb, I stand by the fact 25-30amp batteries are safer and make more clouds on crazy octuplet .15ohm 110W+ coil and my set of 3 LG HB4s are perfect for my Wismec Reuleaux RX200"S" updated to 150W and easier menu and TC options. Though I'm a non TC vaper for life. HB2s, HB4s, and HB6s are different. HB2s are weaker than 30amp cont. discharge, and said to be even closer to 23 amps at full charge. HB4s don't "drop off" and remain as powerful as a fully charged set about the entire time I keep them in use before a charge up, the HB6s are slightly more prone to drop offs of that blast power which turns a non-IPV style medium speed ramp up to an instant blast at the button press instantly. HB4s blast off like the old discontinued Sigelei Fuchai on the updated firmware RX200 "S" model. Some reason so I recommend the "S" version and if the gray/silver original color is 15 dollars cheapers, it's 3.99 for one of the shell parts which are removable and can be replaced with Red, black, white, blue, etc. and the back shell piece is replaceable as well and you can have 2 toned custom mod style. The DNA 200 version Silicone Sleeves fit and there are numerious brands on Amazon to research for under 9 dollars, usually $7.89 for directconnection (makers of silicone mode sleeves that fit snug enough to still remove them easily but are thick, protect from liquid entering the mod via buttons or battery hatch, plus, they have 20 colors give or take 4. Top of it's covered with enough room for TFV4 and TFV8 Cloud Beast 24.5mm oversized diameter tanks. and the screen is in full view...best sleeve brand. Anyway. I think 3 LG HB4s for the TFV8 are safest and more appriate, while the LG HD2C 2100mAH 25amps TRULY as tested by many industry trusted and credible testers who allow anybody access to the detailed process and graphs. Not only Mooch but 3 others I follow. So I'm glad I can use HD2C 2100mAH x 3 in the RX200S unless I'm using the TFV8. Yes I have the cash for it. I've been saving for the next generation of tanks, and I had a feeling the RX200"S" model was coming out. Less of a cheap plastic fell, solid as hell, battery hatch stays in place more than most mods and I think using 23amp or 20amp batteries aren't safe and limit my subohm tank coil and wattage options. I won't buy more coils after using up the 3 included with the Cloud Beast tank Kit for a while but 32 dollars at a certain site, 3 coils, spare pyrex, and washers or rubber thingys, whatever they're named, I can't say no. The vapor on the Sextuplet coil is "cooler" so I won't burn my lungs but the youtube videos show clouds I've never seen made from one tank hit before and the person on video used the Sigelei 213 at 90W. It's no safe to use 25Rs or HG2 20a 3000mAH LG brown batteries on .15ohm coils at over 108W is I choose. TFV4 and Triton 2 .3ohm Kanthal, or my Steam Engine .25ohm stainless VW mode coils at 90W is safe with the 25amps. I just wanna be able to vape up to 140W on the Sextuplet Turbo TFV8 coil and LG HB4s are made for high wattage and resistance vaping on a regulation box mod. HB6s are for the mech mod things with .02 ohm custom made coils and crap like that. HB2s should be discontinued and production halted because it's not really helpful with amperage of other LG higher mAH cells and 1500mAH like the 30a coils have. That's a waste of LGs money once the sites begin selling HB4s and not ONLY HB6s. They are different and HB4s took the crown according to the charts of indie pro testers. Overall, they are best with low mAH but it's also said to be closer to 1770mAH in reality. So....Don't tell me about ohms law. I have the potential to vape at 250W and so do my .15ohm coils when the TFV8 Cloud Beast arrives. Do your math then. I'm sharing info and I can't speak on what I don't know, have used enough to form a solid opinion, or use in another way somehow. HD2s are very week, VTC4s I have coming and I can have my computer whiz electronic master test them so I can say with confidence there are some left in one sites warehouse and then I'll direct you to $6.50 untouched, boxed, VTC4s (which are the most powerful Sony 18650s, people are dumb as they say buying VTC5s when there are 10 LG cells just released the past season and one just today claiming 2100mAH and better performance than HD2Cs call HD4s. I have a feeling they are the ones to out last HD2Cs and not have that drop off after 20% of the life is used ala VTC4s. Again LG HB4s are 1500mAH and last all night in my RX200S but 25amps are all I need and would love 3 2100mAH 25a nominal voltage LG newly created cells. If you use Uwell premade coil replacements on the Uwell Crown for example, you must pop in HB4s or if have a choice PINK HB6 batteries instead of the ugly colored ones. The pinks are proven to be better and don't get too warm which is an issue with high resistance vaping at high wattages. Again HB6s are only for custom mech mod insanity type of a vaping hobby not a RX200S TFV4 user like myself. Just make sure the indie testers say the battery is safe all around and is a minimum of 25amps please. The tanks and coils that we have to choose from are very intense. So get HD2C (with the C, not the purple HD2s, they're horrble I know first hand). Also get a set of HB4s so your're no limited to any coil or ANY subohm tank and wattage combining all three of the powerful newer tanks being sold lately. (hopefully you bought the Sigelei Fuchai and don' t use TC because that's my next mod to add to my collection.