Batteries in a Regulated Mod

[PuffADay]

I currently use Purple Efest 18650s 35A in my sigelei 150 and it is my go to device my FM Copper Clone Mech mod being my back up.
Other than the output and how much the battery can truly sustain, is there a difference when it comes to regulated mods?
Does the board release the same amount of power no matter the battery (being that they can support it).
Should I go out and buy the VTC5s (I'm on a budget so if its not hitting harder than please state no)

 

[Ryedan]

It's pretty well known that the 2500 mAh Efest batteries have a 20 amp continuous discharge rating, not 35. At 150 watts, the Sigelei will draw close to 30 amps from each battery when they are almost drained, so you're way over that rating. They'll be at around 20A at 100 watts. Atty resistance does not matter because you're setting watts.

Once you start using the Sigelei, you would do well to mark that pair of batteries and only use those two in this mod. Never use one of them in another mod by itself and charge them together. You want to keep these two batts as much the same in performance as you can and this is the best way to do that. If you want to continue to use the mech mod occasionally, buy new batts for the Segelei and keep the existing ones for the mech.

The board will pull the amps it needs from the batteries no matter what the batts are rated for. The same is true in a mechanical mod, but in that case amp draw depends on your atty resistance. If the battery can not deliver the amps safely it will start to heat up. If it gets too hot it will vent and that can be dangerous.

Sony VTC series batteries are the only ones I know of that are rated for 30A. RTD Vapor has VTC4's in stock right now. No one that I know of has authentic VTC5's in stock at this time.

 

[PuffADay]

^Extremely informative and exactly what I needed thanks mate.

 

[sdmf74]

I have always wondered about this as well. This is interesting then cause say for instance if I am only using DNA 40 devices I will never need a battery with higher than a 20A max continuous discharge rating
correct?
Or to put it a different way I would NOT benefit in anyway from using higher than a 20A max continuous discharge rated battery. So it seems an excellent battery for the DNA40 chip would be
the LG 18650HG2 20A 3000 mAh Battery.
Please correct me if this is incorrect.

 

[Mooch]

You could get a benefit from using a higher-than-20A CDR battery if its voltage-under-load was better (i.e., it hits harder) at your discharge current level or if the capacity was higher. The >20A CDR cell will most likely have lower capacity though, but the harder hitting...maybe.

 

[sdmf74]

Sorry I meant capacity (mAh) aside. By using the ohms calculator here if I use for instance a .14ohm coil at 40 watts (DNA40's max) I am only using 16.9A.
Since this is probably the lowest resistance I will ever build and the maximum power from the DNA40 chip I can never exceed 16.9A

 

[KenD]

Sorry I meant capacity (mAh) aside. By using the ohms calculator here if I use for instance a .14ohm coil at 40 watts (DNA40's max) I am only using 16.9A.
Since this is probably the lowest resistance I will ever build and the maximum power from the DNA40 chip I can never exceed 16.9A

With regulated mods the resistance of the atty doesn't matter. The wattage and battery charge determine the amp draw. Assuming a 90% efficiency of the device, you're drawing 10.58 amps with a fully charged battery and 13.89 with the charge at 3.2v. That doesn't account for the wattage fluctuation in temp protection though, or preheat.

Sent from my C6903 using Tapatalk

 

[sdmf74]

So it would be safe to say that greater than a 20A battery is NOT needed in a DNA 40 device since the max input current rating of the chip is 16A.

 

[folkphys]

And right now, from the looks of some test results, I'd say the Samsung 30Q is a great choice for maximizing your mAh. Either that or the new LG HG2. Both are 3000mAh. I'm using both and so far, so good.

Sometimes however, a lower mAh battery will last longer in a regulated box than a battery with a higher mAh. it just depends on how close to the CDR of the higher mAh battery you're taking it. it has been borne out through testing that actual mAh will drop significantly when you're discharging up towards the battery's CDR. This is because CDR ratings are calculated and tested using relatively low current draws (~2 amps if I remember corrrectly), which is way less than what most of us are actually using these batteries at.