Battery/ Mod combo for TFV12

[Suggs]

Evening all. I'm in need of some advice before I spend my hard earned cash. (Apologies if this belongs in the hardware section but I was unsure).

I recently got a TFV12 and it seems pretty good but it's draining my batteries pretty quick compared to my old Uwell Crown.
I'm currently using an IJOY dual 26650 and they take forever to charge so looking for new mod and batteries. I'm considering a smok GX350 with 4 * LG HG2 batteries and just wondering if this is a good idea. Would the HG2's be able to safely put out 350W (Not that I will go that high regularly)?
I want something that will last all day. My 8400mah's (Combined) just don't quite seem to last and the range of 26650's to choose from is fairly small.

If anyone has a TFV12 or just any suggestions on better 26650's or a new 18650 mod and batteries I would appreciate any advice; particularly on the GX350/ HG2 combo.

Thanks

 

[Eskie]

4 HG2 batteries should last a little bit longer than 2 26650's from iJoy, but not a ton if you're planing on 350W all day. The HG2's have a CCR of 18A. Running them at 350W will reduce their lifespan as you are well exceeding that rating. A totally off the cuff calculation usually has a 20A battery (pretty close to the HG2) of about 60W, so 4X60=240W and you're within the CDR. Yes, you can run them harder but at the expense of lifespan and excessive heating under load. Should anything go amiss, you have no real reserve.

You could go with 30A batteries from LG, but those will have a capacity of only 1500mAh, and even with 4, you're below the 26650s in capacity you're currently using. However, if you can get by with a lower wattage (150-200W really should be more than enough, even for a TFV12) then you will extend your run time with 4 batteries like the HG2s with a capacity of 3000 mAh.

Or you could wait for mods coming out in the 20700 form factor (that's the correct number, isn't it? I'm getting all confused with these) that can provide 30A a battery with a higher capacity. No idea how long you'll be waiting for them to be available though.

 

[IMFire3605]

350watts on a GX350 with LG HG2 batteries, short answer yes, but your time between recharges will be worse than with the iJoy with 2 26650's, as the recharge point will be about 3.9 to 4.0v per battery with the HG2's being 20amp CDR. To take batteries down to the average cutoff of 3.2v per battery you would be looking at 4 LG HB2, HB4, HB6 1500mah 30amp CDR batteries. Taking batteries down to 3.7v per battery at 350watts would be about 26ish amps CDR where the Sony VTC5A 2500mah 25amp CDR battery would come into play. In all honesty, sorry you got swindled into the hype that is SMOK TFV tanks are, the TFV8 line alone were monsters and battery vampires in themselves, the TFV12 is even more so, JMHO, as I see no ideal reason to be over 80watts on any device let alone 100watts plus.

With any regulated mod the formula to determine maximum amp draw is

(Set Watts/Lowest Battery Charge)/Mod Chipset Efficiency Rating = Maximum Amps

Set Watts or Desired Watts = Simple to explain
Lowest Battery Charge Level = Generally this averages about 3.2v per battery, in a series mod which the GX350 is, it is voltage X Number of Batteries, being 4 we get 3.2v X 4 = 12.8v lowest voltage needed for the formula
Mod Chipset Efficiency = the control board takes power to function, on average this is about 10% the voltage signal, leaving use 90% reaching the coils.

(Set Watts/12.8v)/90%= Amps we can reverse this knowing the Battery CDR

20amps X 90% = 18 X 12.8v = 230.4 Watts Maximum you can run those HG2 in the GX350.

 

[Eskie]

That's why I love the quick 60W figure. It's easy to remember without math and within the acceptable range of error for this kind of stuff.

And i agree, I don't get these "300W" coil builds they're releasing. Maybe if you wanted a small space heater.

 

[IMFire3605]

Yup, and being the TFV12 was released post-August 2016, the legality of a US vendor selling them is a gray area to begin with without an approved FDA PMTA Document from SMOK or the US Vendor.

 

[Suggs]

Thanks for the quick replies. I only bought the TFV12 due to the TPD in the EU now and wanting to essentially future proof myself whilst I still have the chance.
I am using the V12-X4 coils which I beleive say 90-130W is ideal for them. 110W Would be plenty for me really so sounds like the HG2's may be a better bet if i'm not aiming for the full 350W.
As 4*HG2's would be 12000mah would i essentially increase battery life by approximately 50% or would it not be that simple. Only asking as it will cost me £20 or so for another set of 26650's or £100 or so for new mod and 18650's so trying to decide if it would be worth it.
Also i have not heard anything about the 20700's. Anyone able to shed any more light on when these may be coming out?

 

[IMFire3605]

Thanks for the quick replies. I only bought the TFV12 due to the TPD in the EU now and wanting to essentially future proof myself whilst I still have the chance.
I am using the V12-X4 coils which I beleive say 90-130W is ideal for them. 110W Would be plenty for me really so sounds like the HG2's may be a better bet if i'm not aiming for the full 350W.
As 4*HG2's would be 12000mah would i essentially increase battery life by approximately 50% or would it not be that simple. Only asking as it will cost me £20 or so for another set of 26650's or £100 or so for new mod and 18650's so trying to decide if it would be worth it.
Also i have not heard anything about the 20700's. Anyone able to shed any more light on when these may be coming out?

I forget the actual formula to figure actual Watt Hours (WH/wH) from the Mah of a battery, but general rule of thumb with multi-battery mods, series (analogy a 3 or 4 battery stacked flash light, previous positive of battery meets next negative or wired to do the same) voltage is X number batteries, Mah and CDR are the same as a single battery, parallel battery config (side by side all positives are up and all negatives are down) voltage of single battery is the same, Mah is X number of batteries, CDR in theory is X number of batteries but in practical practice you gain an extra 50% for each battery, 2 batteries 1.5X single battery CDR, 3 batteries 2X single battery CDR.

The GX350 with 4 3000mah 20amp CDR batteries in actual Watt Hours should give you 1.5 to 2X the runtime of your dual 26650, even in a series config and will handle the TFV12 a lot better being there is 12.8 to 16.8v of operating range to push sufficient watts and not as taxing as a dual battery series or parallel, which rating at 8400mah that Ijoy Lux 215 sounds to be in parallel giving a 3.2 to 4.2v operating range relying on straight amps to boost high enough.

 

[EIHYPI]

I forget the actual formula to figure actual Watt Hours (WH/wH) from the Mah of a battery, but general rule of thumb with multi-battery mods, series (analogy a 3 or 4 battery stacked flash light, previous positive of battery meets next negative or wired to do the same) voltage is X number batteries, Mah and CDR are the same as a single battery, parallel battery config (side by side all positives are up and all negatives are down) voltage of single battery is the same, Mah is X number of batteries, CDR in theory is X number of batteries but in practical practice you gain an extra 50% for each battery, 2 batteries 1.5X single battery CDR, 3 batteries 2X single battery CDR.

The GX350 with 4 3000mah 20amp CDR batteries in actual Watt Hours should give you 1.5 to 2X the runtime of your dual 26650, even in a series config and will handle the TFV12 a lot better being there is 12.8 to 16.8v of operating range to push sufficient watts and not as taxing as a dual battery series or parallel, which rating at 8400mah that Ijoy Lux 215 sounds to be in parallel giving a 3.2 to 4.2v operating range relying on straight amps to boost high enough.

I don't get this TFV12 hype. When the TFV8 Cloud Beast hit the market that was the "craziest" tank for clouds so I got one. Now that the TFV12 came out, you gotta use 3 to 4 battery mods and can't even use it with my LG 20A 3000mah in my Alien because I can only go up to 120 watts safely. When I use my Cloud Beast I don't even need to go above 80 watts with the T8 coils to get a very decent cloud. My build on my Velocity V2 RDA using straight wire 22G kanthal with 6 wraps @ .21 ohms at 85 watts beat a friend in a friendly competition who was using the TFV12. So I dig the TFV8 Cloud Beast if I want decent clouds from a tank but not the TFV12.

 

[Eskie]

Thanks for the quick replies. I only bought the TFV12 due to the TPD in the EU now and wanting to essentially future proof myself whilst I still have the chance.
I am using the V12-X4 coils which I beleive say 90-130W is ideal for them. 110W Would be plenty for me really so sounds like the HG2's may be a better bet if i'm not aiming for the full 350W.
As 4*HG2's would be 12000mah would i essentially increase battery life by approximately 50% or would it not be that simple. Only asking as it will cost me £20 or so for another set of 26650's or £100 or so for new mod and 18650's so trying to decide if it would be worth it.
Also i have not heard anything about the 20700's. Anyone able to shed any more light on when these may be coming out?

The 20700 are the latest and greatest, but far from universally available and and are obviously not going to work in any mod that uses and 18650. If it were me, and I was running at 110W, I'd be perfectly happy with another set of 22650s for £20 over a new mod and 4 new batteries for £100. However, that answer is in the setting of my having several mods with 3 batteries for higher wattage use (which I really don't do, I just like the extra battery life). But if the iJoy Lux (I assume that what you have) is your only "higher power" mod, having a backup or additional high wattage mod might be justified.